Amazon $169.99 Think of the Milliard Tri-Folding Memory Foam Mattress as a small space's answer to a guest bed. At first glance, it looks just like another mattress. Milliard sells two memory foam ...

Milliard 4.5-inch Memory Foam Replacement Mattress It doesn’t take much to improve upon the busted, old mattress—or the disappointing new one—lurking in your sofa bed. This is a great start.