This Avenco Airsea 12" king hybrid mattress is $24 off at Walmart. It pairs pocketed coils with memory foam and carries a CertiPUR-US certification for the foam.
Shipping is free on this order, too. Buy Now at Walmart
Features 12" thick hybrid mattress with pocketed coils & memory foam Medium-firm comfort level Pillow top design CertiPUR-US certified foam Edge support & motion isolation to limit movement between sleepers King size, comes in a box