LOL - we have ours in the living room (no other place for it really) my DS7 bounces from the trampoline to the sofa, to the ottoman and back again!

I've (mostly) given up on trying to save the sofa.

Ours doesn't fold - it's out pretty much all the time. But if we need it out of the way we can lean it against a wall.
Purchased it at a store that sells fitness items.

We also use one of these:

http://shop.fitnessdepot.ca/Bosu-Ball-Home-Balance-Trainer--P79.aspx#.VV8oqEbMKcM