Has anyone ever used this cushion or know of anyone who has ? It is a small air filled cushion with little nubs that you sit on that is suppose to help with back pain. I saw it advertised but none of my local stores carry it including the medical supply store. I don't have money to waste if it does not work ($28 inc. shipping) but if it does it would be worth the money to relieve my back pain. Any thoughts?
P.S. I tried to post a picture but it would not copy and paste.