Why You Can't Use American Express At Costco - Chowhound

Aitor Rodriguez Claro/Shutterstock Shopping at Costco can be an amazing way to stock up on necessities — and even some special treats — in bulk, but the store does come with a few essential rules. The most obvious one is its members-only shopping policy, which is a major part of its business model and even extends to amenities like the famed food court. But there are some lesser-known policies to keep in mind as…