Walmart: Twin Mattress,8″ Gel Memory Foam Mattress with Removable Cover Mattress in a Box Medium $89.99 ($390)

The bed that started it all, this Medium Firm Mattress features 2 inches of breathable gel-infused memory foam to cradle pressure points like hips and shoulders while keeping the rest of your body fully aligned. When paired with a dual-layer comfort foam base, the result is a perfectly supported sleep. 8 inch gel memory foam mattress provides a medium firmness, not too firm or too soft. Washable zipper cover adds an extra level of style and a non-slip, making it’s nice to sit or sleep on without having to feel irritated with the feel of typical memory foam.Ready for instant enjoyment. Compressed into one box that is easily shipped and maneuvered into the bedroom. Simply unbox, unroll and this gel memory foam mattress does the rest, expanding to its original shape within 72 hours.Available in multiple sizes including Twin mattress, Full mattress, Queen mattress, King mattress.