I have a Needak, which is what Urban Rebounder used to sell before they came up with their own rebounder.
I'd look for a Permatron mat (Urban Rebounder and Needak have one, as do some others) and large springs (you don't want one that has cotton webbing instead of springs).
The bar isn't necessary unless someone has bad balance (some senior citizens or very overweight people, perhaps?).
Mind folds in 1/2, which is nice for storage, but I leave it up most of the time.
HSN sells the Urban Rebounder.
QVC might also? (If so, I'd order through them, because they have excellent customer service and a no-hassle return policy).