Walmart offers the HoMedics 6" Twin Memory Foam Mattress, model no. 200821660110, for $79 with free shipping. That's $5 under our November mention, $20 off list, and the lowest total price we could find. The top 2.5" are memory foam and the bottom 4" are stabilizing foam.

It's available in Full Size for $99 with free shipping. That's $10 under our November mention, $36 off list, and the lowest total price we could find.