This deal has ended.
Overstock takes $20 off the price of the Comfort Dreams 11-inch Select-A-Firmness Memory Foam Queen-size Mattress, lowering it from $339.99 to $319.99. Even better, they are shipping mattresses and mattress pads for free, through 9/6. This mattress measures 11-inches thick and comes in soft, medium or firm for your comfort. There is no sales tax (except UT).