This deal has ended.
The Serta 4-inch Memory Foam Mattress Topper with Contour Pillows drops from $154.99 to $132.29 at Overstock. With free shipping, that's the best deal we've seen on this set since January, and the current price low by a wide margin (it's $196.97 at Amazon). It is available in five different sizes for this same price and is well reviewed with 4.6 out of 5 stars from over a whopping 3,100 buyers. There is no sales tax (except UT).