Everyone loves a deal, especially so when it comes to grocery shopping. The allure of saving without using coupons has lured many consumers over to warehouse stores like Costco, BJ's and Sam's Club. These megastores make you think you're saving money by buying items in bulk sizing, but are you really getting a deal?

When it comes to food, buying in bulk can be a mixed bag: Many items are definitely worth it, especially when you eat them often. Other items are simply not worth stocking because they spoil faster than you can consume them and don't offer much of a discount.

To shop at a big box store, there are two things to keep in mind: First, you need to take your eating habits into account -- for example, are you really going to eat a giant tub of mayo? Second, pay attention to the prices at your supermarket, because oftentimes a weekly sale will give you higher savings than buying in bulk. Find the results of our research in the slideshow below.

Meat -- Buy This
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Warehouse stores do offer good quality meat and if you have a freezer you can surely stock up on the surplus you're buying. Bulk packaged meat is especially useful when you're planning on having a party and you need many pounds of ground meat for hamburgers, for example.

Photo from hmboo, Flickr.

Sources: iVillage, Forbes, Coupon Sherpa.