Costco vs Amazon AU vs Catch: Bulk Value in Australia 2026

Updated: September 2026.

TL;DR verdict

For a bulk shop in Australia in 2026, Costco wins on true per-unit price for pantry, toilet paper, meat and fresh produce for a family of four or more. Amazon Australia wins on breadth, on delivery, on non-food and on repeat subscribe-and-save on household essentials. Catch wins on marked-down brand-name stock across health, beauty, home and toys, especially during Club Catch flash sales. Use ShopBack to check cashback on all three before you tap pay, because a bulk cart is where the cashback dollar-value adds up.

Where the per-unit price gap comes from

The three retailers run different economic models and that shapes where the value sits.

Costco is a members-only warehouse that runs on a razor-thin markup over cost and monetises through membership fees rather than gross margin. Costco Wholesale reported net sales of 249.6 billion USD in FY25, with membership fee income of 4.83 billion USD and a member renewal rate of 90.5 percent in the United States and Canada (source: Costco Wholesale FY25 annual report, released 25 September 2025, https://investor.costco.com/financial-information/annual-reports). That 90.5 percent renewal number is a strong signal that members feel they get their fee back.

Amazon Australia runs on breadth. Amazon Q2 2026 press release noted Prime membership continues to grow globally, and the company said in its earnings release that "we continue to see strong customer response to fast, free delivery on hundreds of millions of items" (source: Amazon Q2 2026 earnings release, 31 July 2026, https://ir.aboutamazon.com/news-release/). Amazon Australia's model relies on Prime pulling repeat orders across many small baskets rather than one enormous cart.

Catch is owned by Wesfarmers, which acquired the business in 2019. Wesfarmers reported in its 2026 half-year results that Catch has been consolidated within the Wesfarmers OneDigital platform alongside OnePass, with the group focus on lifting cross-shop between Kmart, Target, Bunnings and Catch (source: Wesfarmers 2026 half-year results, released 19 February 2026, https://www.wesfarmers.com.au/investors/reports-results). Catch monetises through vendor promotions and clearance stock, and its price advantage is deepest on discontinued or seasonal brand-name lines.

The Australian Bureau of Statistics recorded headline CPI at 2.7 percent year on year for the June 2026 quarter, with food and non-alcoholic beverages up 3.0 percent year on year (source: ABS Consumer Price Index Australia June quarter 2026, published 30 July 2026, https://www.abs.gov.au/statistics/economy/price-indexes-and-inflation/consumer-price-index-australia). That grocery inflation is exactly the tailwind that makes bulk shopping compelling in 2026.

The three retailers, side by side

Retailer	Membership fee	Delivery	Where it wins	Where it loses
Costco	65 AUD Gold Star (individual) or 60 AUD Business per year	Some metro postcodes with 100 AUD minimum, non-food two to five days	Fresh food, pantry per-unit, meat, petrol	Storage space required, warehouse trip
Amazon Australia	Prime 9.99 AUD monthly or 79 AUD annual (free tier fine)	Same-day and next-day metro on Prime	Breadth, subscribe-and-save on essentials, non-food	Fresh food range thin, marketplace stock inconsistent
Catch	Club Catch 69 AUD per year (OnePass bundle available)	Metro 2 to 5 business days, threshold varies	Clearance brand-name stock, toys, health	No fresh food, stock varies

Costco Australia

Costco has fifteen warehouses in Australia as of 2026, spanning every mainland capital plus Newcastle, Wollongong, Ipswich and Adelaide. The Gold Star (individual) membership is 65 AUD per year and Business membership 60 AUD per year. Executive tier at 110 AUD adds a 2 percent annual rebate up to 1100 AUD.

The economic case for Costco depends on your household size. For a family of four buying a weekly shop, the per-unit price on the Kirkland Signature range and on the fresh meat counter typically undercuts the Coles and Woolworths equivalent by 15 to 25 percent on the same weight basis. Toilet paper, olive oil, coffee, cheese, nappies and dishwasher tablets are consistently the best per-unit price in Australia at Costco.

The friction is storage and the trip itself. A Costco shop is a car trip, an hour minimum in-store, and a boot full of stock that needs cupboard and freezer space. For a couple in an apartment with limited storage the economic maths does not close, and Amazon subscribe-and-save on the same essentials often wins on convenience-adjusted terms.

Costco petrol is worth mentioning. Every warehouse has attached petrol at prices that consistently sit five to fifteen cents per litre below the local metro cycle, and members can save two hundred to five hundred AUD per year on a two-car household from fuel alone. That number alone pays the membership several times over.

Amazon Australia

Amazon Australia turned on the Sydney fulfilment centre in 2017 and by 2026 operates nine fulfilment centres across the country with a fleet of local delivery stations. Prime delivery windows now include same-day in most metro areas.

The Amazon model wins for bulk buying in three specific categories. First, subscribe-and-save on household essentials: laundry pods, dishwasher tablets, toilet paper, kitchen roll, toothpaste and pet food. The subscribe-and-save discount of five to fifteen percent on repeat orders plus Prime free shipping makes the effective per-unit price competitive with Costco without the warehouse trip.

Second, non-food electronics, home and hobby. Amazon carries breadth Costco and Catch cannot match, and marketplace competition keeps prices honest on well-known items.

Third, back-to-school and Christmas bulk. Amazon's algorithmic pricing on lunchboxes, water bottles, backpacks, stationery and toys in the pre-back-to-school and pre-Christmas windows undercuts Kmart and Target on brand-name items regularly.

Where Amazon Australia loses is fresh food and the perceived-value trap of marketplace sellers. Fresh food range on Amazon Fresh Australia is narrow, and marketplace sellers on Amazon can inflate the price on a niche item where Amazon itself is not the seller.

Catch

Catch has been repositioned since the Wesfarmers acquisition as a marketplace-plus-clearance play. The site sells first-party clearance stock and third-party marketplace listings across health, beauty, home, toys, sports and apparel. Club Catch membership at 69 AUD per year gets you free standard shipping on eligible orders and access to member-only flash sales.

The Catch value case is category-specific. Brand-name discontinued beauty (Elizabeth Arden, Clinique, Estee Lauder), sports (Adidas, Puma, Under Armour), toys (Lego seasonal, Barbie), and small kitchen appliances often sit at prices 20 to 40 percent below RRP. The key word is discontinued, meaning last-season colour, packaging refresh, or overstock. If you are happy on last season's palette or last year's Lego set, Catch is a serious cashflow win.

Catch does not do fresh food and does not target weekly grocery. Its shop-and-save case is opportunistic, driven by a Club Catch app notification or a category flash sale, not a weekly staple order.

Membership economics: does the annual fee pay off?

For each of the three, do the maths honestly.

Costco Gold Star at 65 AUD per year pays back if you spend more than roughly 350 AUD per year on categories where Costco is 20 percent cheaper than your grocery baseline. For a family of four that is one large shop. Executive at 110 AUD pays back if annual spend exceeds 2500 AUD. Petrol savings alone typically pay Gold Star fee for anyone with a car.

Amazon Prime at 79 AUD annual (or 9.99 AUD monthly) pays back if you place more than roughly ten to fifteen delivery orders per year on Prime-eligible stock, or if you use Prime Video enough to displace another subscription. For a household ordering monthly, Prime is a straight win. For a household ordering four or five times a year, use the free-shipping-over-59 AUD tier and skip Prime.

Catch Club at 69 AUD annual is the toughest sell because Catch is opportunistic. If you buy from Catch fewer than five times a year, Club Catch does not pay back. If you use the OnePass bundle with Kmart, Target and Bunnings you get more value for the same fee.

Where each retailer breaks down

Costco breaks down on impulse and on smaller households. If you are shopping alone or as a couple, the pack sizes force waste, and the trip logistics eat any per-unit saving. Costco also does not stock every mainstream brand, so if you are loyal to a specific yogurt or a specific coffee, you may find the store simply does not carry it.

Amazon Australia breaks down on fresh food and on niche marketplace stock. Fresh grocery is thin outside metro Sydney and Melbourne. Marketplace sellers can be slow, and returns on marketplace items go through the seller not Amazon.

Catch breaks down on stock reliability. What you saw on the app yesterday may be sold out today, and the same item may not restock. Catch is not the retailer for a repeat weekly order.

Use case segmentation

For a family of four buying weekly groceries and pantry: Costco for the bulk staples, Amazon subscribe-and-save for household essentials, occasional Catch for a flash-sale brand item. Use ShopBack cashback across all three merchant pages so the split works in your favour.

For a couple in a Sydney or Melbourne apartment: Amazon Prime plus Coles or Woolworths online. Costco is a stretch for storage. Catch is worth checking during flash sales but not a repeat destination.

For a household stocking up for a party or a big event: Catch for balloons, disposable tableware, gift-with-purchase toys and clearance alcohol accessories. Amazon for gift wrap and last-minute delivery. Costco for the bulk food platter.

For back-to-school for a family with three or more kids: Amazon plus Catch. Kmart still leads on uniforms and basics, but Amazon and Catch beat on brand-name lunchboxes, water bottles and shoes when timed to the July sale windows.

When this does not apply

Two edge cases invert the ranking. First, if you live outside metro delivery zones, Amazon delivery windows lengthen and Costco requires a road trip, which may make Catch and your local IGA or Foodland the practical winner. Second, if your household has strict dietary requirements (halal, kosher, vegan, gluten-free specialist products), all three retailers may not stock what you need and specialty online grocers become the actual play.

How to save maximum across all three

Rotate deliberately. Use Costco for pantry once a month, Amazon subscribe-and-save for the ten to fifteen most-used household items on auto-renew, and Catch for opportunistic buys when Club Catch notifications fire on a category you were already planning to buy.

Check ShopBack on all three merchant pages before you tap pay. On a two-hundred-dollar Amazon order or a five-hundred-dollar Costco order, the cashback dollar value is where the compounding happens. Activate ShopBack via the extension so you do not forget the click.

Frequently asked questions

Is Costco Australia cheaper than Amazon on groceries?

Yes on most pantry and fresh categories, on a per-unit basis, provided you can buy the pack size. Amazon's fresh grocery range is narrow in Australia and the pack sizes are smaller. Costco's Kirkland Signature range routinely undercuts Coles and Woolworths equivalents by 15 to 25 percent per unit.

Is Amazon Prime worth it in Australia in 2026?

Yes if you order online more than once a month. Prime at 79 AUD per year pays back on shipping alone with roughly ten to fifteen Prime-eligible orders per year, and Prime Video displaces another subscription. For an occasional shopper, use the free-shipping-over-59 AUD tier and skip Prime.

What is Club Catch and does it pay back?

Club Catch is a 69 AUD per year membership that unlocks free standard shipping on eligible orders and member-only sale access. It pays back if you buy from Catch five or more times a year. Below that, the fee outweighs the shipping saving. Bundle with OnePass for Kmart and Target if you shop those regularly.

Does Costco Australia deliver?

Yes in selected metro postcodes with a 100 AUD minimum order for non-perishables, and Costco Grocery for eligible members. Fresh food same-day delivery is available in limited Sydney and Melbourne zones through the Costco Same-Day service. Check your postcode on the Costco website.

Is Catch reliable for brand-name items?

Yes for first-party clearance stock. Marketplace listings on Catch vary by seller. Filter for "sold by Catch" if you want the retailer's warranty and returns experience rather than a third-party seller's.

Which retailer offers the best return policy?

Costco offers the most generous return policy in Australia, accepting most non-food returns with no time limit if you have proof of membership purchase. Amazon offers a 30-day return window on most first-party items, longer on some categories. Catch is 30 days for first-party stock and seller-dependent for marketplace.

Can I use ShopBack cashback on all three retailers?

Cashback for Costco, Amazon Australia and Catch is available on ShopBack when they are listed as merchants and running their standard programs. Activate ShopBack via the extension before you click through to the retailer, and check the current cashback rate on the ShopBack merchant page.

Are Costco petrol prices worth the membership alone?

Often, yes, for a two-car household. Costco petrol consistently sits 5 to 15 cents per litre below the local metro cycle. For a family driving 500 litres per month across two vehicles, savings of 300 to 900 AUD per year cover Gold Star membership several times over.

Is Amazon subscribe-and-save cheaper than Costco on the same item?

On single-item price for household essentials, subscribe-and-save with 5 to 15 percent auto-discount is often within a few percent of the Costco per-unit price. Convenience-adjusted, Amazon usually wins because there is no warehouse trip. For a family volume, Costco wins on absolute price.

What is OnePass and how does it fit with Catch?

OnePass is Wesfarmers' cross-brand membership at 4 AUD per month covering Kmart, Target, Catch and Bunnings on eligible orders. It includes free delivery on eligible items across all four retailers. If you already shop Kmart or Target online, OnePass replaces Club Catch as the better-value membership.

Which is best for a Christmas bulk shop?

Costco for the bulk food and drink platter. Amazon for gifts, toys and last-mile delivery on gift wrap. Catch for gift-with-purchase toys and discontinued Lego at 30 to 40 percent off. Split the shop across all three.

Does Amazon Australia sell fresh grocery like Woolworths and Coles?

Amazon Fresh is available in limited Sydney metro postcodes but the range is narrow. For a weekly fresh shop, Coles or Woolworths online remains the practical option in most Australian cities. Amazon is a supplementary rather than replacement fresh grocer.

How do I stack cashback across all three?

Use ShopBack on each individual retailer transaction. Cashback stacks with the retailer's own subscribe-and-save, member discount and clearance pricing, not against a competitor's platform. Activate ShopBack via the extension so each qualifying purchase registers.

Primary sources referenced

• Costco Wholesale FY25 annual report, released 25 September 2025: https://investor.costco.com/financial-information/annual-reports
• Amazon Q2 2026 earnings press release, 31 July 2026: https://ir.aboutamazon.com/news-release/
• Wesfarmers 2026 half-year results and Catch commentary, released 19 February 2026: https://www.wesfarmers.com.au/investors/reports-results
• ABS Consumer Price Index Australia June quarter 2026, published 30 July 2026: https://www.abs.gov.au/statistics/economy/price-indexes-and-inflation/consumer-price-index-australia
• OnePass membership terms and Wesfarmers OneDigital: https://www.onepass.com.au/

By Trang Do, Cashback Expert at ShopBack Australia. This article is general information, not financial advice. Retailer membership fees, delivery thresholds, subscribe-and-save discounts and cashback rates change frequently. Verify current terms on each retailer's site and on ShopBack before you buy.