Hi Michael, I made a bounce card from black and white pressed foam rubber, some glue and velcro strip all available from the craft shop. It looks almost identical to the larger one shown on the betterbouncecard video, but at a hugely lower cost. It can also adjust the curvature and 'tilt' the top section. It also lays completely flat, so is easy to carry.
Some commercial items are grossly overpriced IMHO.
Malcolm