Sliver... rather than inflatable furniture... what about a garage filled with hammocks? Some can be stand alone and some can hang from ceiling? I think hammocks are easily stored.
Drunk people + inflatables is probably asking for injuries, or popped inflatables. Just saying.
Another option is buying a bunch of memory foam mattress toppers and setting them up somehow on a flat surface? Temporary bench? Although I can't think of much that would be considered temporary that would be comfortable.
Foldable picnic tables?
Even better.... A billion of these things and you can convert a room in your house to a full time bouncy room when you're not using them in your garage.
http://www.amazon.ca/LUCID-Inch-Fold...oldable+chairs
EDIT: Actually, to arrange them in a way that could make it a big ass super ottoman in an entertainment room (or just padding on the entire floor while watching movies etc.) might be an interesting use for it assuming you get like 2-4 of them.
But seriously. Popped furniture. I'd consider something else.