Newegg offers the ZyXEL Comcast-Compatible DOCSIS 3.0 Cable Modem, model no. BRG35503, for $49.99. Redeem this $30 mail-in rebate to cut the price to $19.99. With free shipping, that's $10 under our September mention and the best price we've seen. (It's a current low by $40.) This modem features channel bonding of up to four downstream and four upstream channels and IPv4 and IPv6 support. Rebates expires December 1.