Mini Trampoline

Hello everyone!  I also posted this on the Lap-Band Message Board & the Exercise Message Board.  I was wondering if anyone uses a mini trampoline for exercise?  I am so bored with walking, videos, cardioglide, etc.  I don't belong to a gym & I'm not really interested in joining one.  I have watched some of those episodes on the BBC channel, "You Are What You Eat,"  and it seems like the mini trampoline is what they use a lot of the time for exercise.  It looks fun!  Anyone do this?  If so, do you know how many calories would be burned from jumping for about 30 minutes.  Also, where would be the least expensive place to purchase one?  Thanks a bunch!!

Sincerely,
Elizabeth