I know you said you are looking for a smaller one, but i have to tell you - we bought our 3 1/2 year old the Little Tikes 8ft by 8ft bouncer & he LOVES IT! It is currently set up in our living room. It is great quality and the best part is he can turn it on himself (using the reset/test button on the plug).
It is a great workout for him (he often is panting when he is done) and it folds up nicely and easily fits in the bag.
It was a little more expensive than we really wanted to spend, but he gotten SO many hours of enjoyment out of it (it is a hit at all his birthday parties, cookouts, and even his friends' parties).
We bought it from Walmart for $150. We originally looked at renting one for his birthday - while this one is smaller the amount of time that he uses it made it well worth while!!
Oh, we used Walmart.com - you log on, order it & then they ship it to the store & you stop and pick it up (no extra cost).
Best wishes - contact me if you have any other questions =O} (____@____.com)