eBay has the Motorola SurfBoard SB6141 Cable Modem DOCSIS 3.0 for $68 with free shipping. The eBay list price is $75 but if you use the “make offer” option and offer $68 it will be instantly approved. This modem typically sells for $90.
Motorola’s easy-to-use SB6141 SURFboard DOCSIS 3.0 Cable Modem offers data rates of over 300 Mbps for received data and over 100 Mbps when sending data.
Features Compatible with Windows®, Macintosh®, and UNIX® computers DOCSIS 3.0 Compatible, featuring: Supports IPv4 and IPv6 to expand network addressing capabilities GigE (RJ-45) data port with Auto Negotiate and Auto MDIX User-friendly online diagnostics The SB6141 includes an internal filter to eliminate potential interference from MoCA signals’ intermodulation beats