modems-modems via eBay offers the Motorola SURFboard DOCSIS 3.0 Broadband Cable Modem, model no. SB6141, for $71.95 with free shipping. That's the lowest total price we could find by $18. It features upstream and downstream channels, support for IPv4 and IPv6, enhanced network management, and more. This modem may not be compatible with all service providers.