11 Items You Cannot Return at Costco

Electronics: Computers, cameras, and major appliances must be returned within 90 days.

Diamonds: Loose diamonds over 1 carat cannot be returned.

Custom Products: Items that have been personalized or custom-built.

Cigarettes and Alcohol: State laws prohibit the return of these items.

Opened Software: Including video games and other digital media. –

Toilet Paper and Paper Towels: Bulk purchases of these items are non-returnable.

Undergarments: Including bras, underwear, and swimwear. –

Mattresses: Unless returned within 90 days of purchase.

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