Overstock has the popular 1" Memory Foam Mattress Topper for $35.99 after a 10% discount that is applied to all memory foam through 3/27. 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 1,600 Overstock users rate this 4.4 out of 5, with 92% recommending it to a friend. Shipping is $2.95 and there is no sales tax (except UT, IN). Spend $100 and use this $5 off coupon.