Newegg offers the ZyXEL Comcast-Compatible DOCSIS 3.0 Cable Modem, model no. BRG35503, for $49.99. This $20 mail-in rebate cuts it to $29.99. With free shipping, that's the lowest total price we could find by $49, although we saw it for $10 less in December. This modem features channel bonding of up to four downstream and four upstream channels and IPv4 and IPv6 support. Rebate expires March 19.