"WEATHER YOU'RE EYEBALLING A case of Gatorade or a 115-count bag of Gorton's Fish Sticks at your local warehouse club, it's hard to argue that the price isn't right. Generally, you will save 20% or more on warehouse club products compared with those at your local grocery store. But that doesn't mean everything there is a good deal. Here are five ways shopping at a warehouse store can cost you more.

A little more additional info regarding # 4.

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Reason not to buy: You'll never use it all before it expires.

Buying bulk just doesn't make sense for items you don't use frequently, whether it's cereal or sunscreen, says Tawra Kellam, founder of Living on a Dime, a frugal-living site. You won't save money in the long run if you end up throwing out a barely-touched item because it's expired. In other words, if you don't frequently get heartburn or indigestion, that 116-pack of Alka Seltzer at Costco for $9.49 may not be as good a deal for you as the 36-pack for $5.29 at Drugstore.com. Both expire about a year after purchase.