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By Real Simple
Updated August 04, 2010
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Memory Foam Mattress Topper
Credit: Over Stock

Upgrade that stiff, standard-issue dorm mattress with a comfortable mattress topper. Memory foam molds to the shape of your body so you’re cushioned no matter which way you toss and turn. The hypoallergenic pad is 2 inches thick and fits extra-long twin beds.

To buy: $50, overstock.com.