Overstock has the popular 1" Memory Foam Mattress Topper for $34.99 after a BradsDeals Exclusive $5 discount valid through 12/20. Plus, shipping is free through 12/17 ($2.95 after), making this the all-time low net price. The memory foam is a gel-like substance that adjusts to the warmth and shape of your body, making your bed more comfortable. The 1" size is the most affordable (everything from 1" to 4" is available). Over 1,200 Overstock users rate this 4.5 out of 5, with 93% recommending it to a friend. There is no sales tax (except UT, IN).