Would like queen size with no stacking (futon mattress)
Fold Out Foam Double Guest Z Bed Chair Folding Mattress Sofa Bed Futon Sofabed | eBay
Great article answering the question "What's a Good Lightweight Folding Mattress?"
This would be super handy! Folds up when you don't need it. Throw an air mattress on top!
Folding Foam Mats - bring one and never struggle with an air mattress again!
Tri-Fold Lounger Beds Futon Package : Hardwood frame and mattress : Shop4futons.com
Do it yourself Coffee Table Bed mattress fold-out
DIY folding sofa bed in an Airstream #rv
Cozy bed frame with soft sides that you can flip up and down! Seems almost like a nest. But more stylish!