This runs about $50, but I bought the cheaper knockoff product on Ebay for $10. Has rave reviews for firming jowl area and, like everything else, you have to use it regularly for it to work. I try to remember to use it while sparking and so far can see some signs of progress. Mainly doing preventive work with it, and have just been trying different aids to see what's what. It would be great if all of these items would just do all the work by themselves and let me know later.
Wide range of prices on Ebay and Amazon. Mine is a cheaper model with no bands for resistance adjustment.