The Best of Costco: What to Buy and What to Avoid

8. Avoid: condiments

Condiments are also a no-go. Not only do you have to purchase large quantities, but it’ll be difficult for your entire family to finish it all. The good news is that condiments don’t necessarily go bad; however, not everyone wants to use ketchup that has been sitting around for years. Keep in mind that each condiment has its own expiry date. Mayonnaise, for example, can only sit for 3 months, and unless you own a sandwich shop, there’s no way that you’ll finish the whole tub before then.