Air Pillow Top Sofa Bed Mattresses
Air pillow top mattresses are simply ordinary mattresses with an air mattresses attached. They are made in just a few sizes. There is no significant advantage to having the two mattresses attached. They work just as well un-attached.
You can create the equivalent of such a mattress by just laying an inflatable camper mattress on your regular sofa bed mattress. It deflates easily and takes up an insignificant amount of extra room. You can just close your sofabed in the normal way. No problem. When you open it next time, just hook up the pump and in less than a minute you are good to go.
Good quality air mattresses with battery operated pumps are available cheaply. As of this writing a twin costs about $30 and a queen size,m about $50.
They are available on outdoor stores. Also in Sears and Wal Mart.