Through Tuesday, Overstock.com is taking an extra 10% off their selection of memory foam. This can be combined with either this 7% off coupon or this 8% off coupon for new customers. 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) at just $33.11 after the 10% off and 8% off. For example, over 700 Overstock users have rated the 1" size a 4.5 out of 5. Shipping is $2.95 and there is no sales tax (except UT, IN).