I absolutely love my mini trampoline (belacor brand). The one I have is very expensive, but the mat part is attached with bungee cords instead of springs. The bounce is incredible, plus it is a good 12 inches off the ground. I had a cheaper typical mini trampoline years ago, but it squeaked alot, and many times I thought I would come close to hitting the floor and just plain fall apart (maybe i'm just a little aggressive on it though

I do this along with the 30ds for jumping jacks, and you can actually run on it. Also, they make them for different body weights.
Anyway, I love it, its pricey yes, but its a really good product. The bungee cords make a world of difference