The Serta 8" Full Size Memory Foam Mattress drops from $299.99 to $269.99 today only. Better yet, activate this coupon to take another $5 off and cut it to $264.99. With free shipping, that's $6 less than the lowest total price we've ever seen for this mattress. It is also the current price low by more than $36. It comes complete with a removable jacquard "eco-friendly" cover, and is well reviewed with 4.7 out of 5 stars from over 400 buyers. There's no sales tax (except UT).