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18 Big Mistakes to Avoid Making at Sam's Club or Costco

Daniel B. Kline, The Motley Fool
A man shops in a warehouse store with a cart.

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Join the club

Membership-based warehouse clubs Costco (NASDAQ: COST) and Walmart's (NYSE: WMT) Sam's Club can save members a lot of money. They can also cost you money in a variety of ways if you're not very careful.

If you join one these chains there are lots of ways you can end up wasting money. To avoid doing that it's important to be aware of some of the traps you can fall into.