I started out with a cheapie I bought online from Sears for about 40 bucks on sale to see if I'd like it. Gave it away and upgraded to a foldable rebounder by Needak. I think it was around $175, but you can google it to find their website because my memory might not be accurate. Rebounders that don't fold are cheaper, incidentally.
Big difference in the spring action with the more expensive version. Fantastic exercise, I love it!