There are many reasons to love Costco, and it's difficult to leave the store without spending $100 on things you didn't have on your list. But there are some things it just doesn't make sense to buy at warehouse stores. Variables such as the size of your household, how quickly you go through things, and what's important to you should all dictate whether you buy something from Costco, or whether it makes more sense financially to buy it in smaller quantities.
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