If you can keep it in a room that has a consistent temperature, should help it from going flat as often. I'd try to store it in a clear acrylic display case that's UV protected. Keep dust off of it and it'll look good.

Can usually get one from Michaels on online.

Does anyone have any experance/tips on storing an autographed football? I just recently aquired my 2nd one, and know from experance that they don't stay inflated. Is there some way to keep them inflated, or is it best to just to forget about it and let them "go flat?"