Motorola SB6120 SURFboard DOCSIS 3.0 Broadband Cable Modem for $69.99 shipped. Here is a screenshot for your reference. This is one of the newer models with IPv4 and IPv6 support and speed over 100Mbps in both directions. Having your own cable modem often means you will not have to rent one from the ISP with a monthly rental fee, but it is important to check with your ISP to ensure compatibility. Most places have this Motorola SB6120 SURFboard DOCSIS 3.0 eXtreme Cable Modem for over $85.