Amazon has a $20 off Instant Coupon for the Arris Surfboard 8200. With DOCSIS 3.1, this is rated as the most future proof cable modem out there amongst the other modems, including Netgear CM1000 and Morotola 8600. And for those worried about the Puma 6 chipset fiasco, Arris wised up and went with a Broadcom for this one.
Just clip the $20 coupon from the product page and it will automatically apply to the order. Should bring the order down from $188 to $168.