Nova Tech US offers the Nursal Heat and Shiatsu Massager Back Seat Cushion for $179.99. Coupon code "W7CTANV3" cuts that to $160.19. With free shipping, that's $191 off list and the lowest price we could find, although we saw it for $10 less last month. It features four adjustable rolling nodes, auto shut-off, and three vibration modes.

Update: The price has dropped to $158.99 before coupon, $141.50 after.