I just got one of those personal fitness trampolines, and man...what a workout. Its a great cardio workout, and its easy on the joints. I'm lovin it. i found this place on ebay that has all kinds of trampolines. check it out!
http://stores.ebay.com/Trampoline-World_W0QQssPageNameZVIStoreHeaderLinksQQtZkm?
http://stores.ebay.com/Trampoline-World_W0QQssPageNameZVIStoreHeaderLinksQQtZkm?