While joining Costco (NASDAQ: COST) or Walmart's (NYSE: WMT) Sam's Club seems like it opens up a world of near-unlimited savings, both companies also offer customers lots of ways to lose money. Just because something is sold at a warehouse club does not mean that it's a great deal for you (or that it's a great deal at all).
When you join one of these membership-based businesses it's important to understand how the game is played and avoid potential mistakes. There are all sorts of savings to be had but there are also numerous traps you can fall into.
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