7 Costco Staples That Superfans 'Always Buy'

While you can buy staples like laundry detergent, trash bags, and eggs anywhere, Costco boasts some of the best prices on everyday products. In fact, you'll never pay more than a 14-15% markup on the wholesaler's stock thanks to its self-imposed cap. Superfans who know the retailer's prices better than most recently shared their favorite Costco staples that are so cheap (and high quality) that they're must buys. Not already a Costco member? You can apply here.

Prices and availability are subject to change.

Related: Best Costco Appetizers and Party Foods for the Holidays and Beyond

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Named the "best value" laundry detergent in a 2022 Consumer Reports analysis, Kirkland's UltraClean formula is popular for its quality-to-price ratio. While multiple Redditors said that they just buy "detergent" from Costco — without naming this one specifically — we're confident that this is one of the wholesaler's best staples.

Related: Costco Laundry Detergent Crowned 'Best Value' — and You Don't Need a Membership to Buy It

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Garbage bags are a must-buy at Costco, and like many warehouse staples, superfans say that Kirkland's products stand out. One shopper joked that they've had three long-term relationships "while still owning one box of Kirkland garbage bags."

Related: The Brands Behind Costco's Popular Kirkland Signature Products

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While every kitchen should have a bottle of high-quality olive oil, it's significantly more expensive than canola or vegetable offerings. That said, Costco sells a variety of olive oils at different price points, some of which are extremely affordable if bought in bulk. Redditors recommend Kirkland's organic olive oil from Italy.

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Versatile, nutritious, cheap, and easy to store, eggs epitomize the perfect kitchen staple. And Costco, superfans say, is the best place to buy them. "They are free range and huge," one commenter writes. Depending on whether you want organic, free-range, or pasture-raised eggs, they vary in price from 28-44 cents each.

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If you consistently fill up at a Costco gas station, your annual savings will likely surpass what you pay for your membership, according to our calculations. What's more, Costco only sells Top Tier gasoline, the gold standard when it comes to fuel. In other words, Costco gas is a high-quality, cheap staple — a clear must-buy product.

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Not only does Costco have an impressive selection of coffee beans, but the retailer also sells them at competitive prices. In a separate thread, superfans said that Peet's Major Dickason's Blend was one of the tastiest offerings at Costco, though some also recommended Kirkland brand coffee.

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One Costco shopper who claims they've found this litter for just $12 in store calls the price "unbeatable." Another superfan added that it's also often on sale, making this a no-brainer for frugal shoppers.