Motorola SB6121 SURFboard DOCSIS 3.0 Broadband Cable Modem for $87.99 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 your internet service provider (ISP) with a monthly rental fee, which saves money in the long run and this is also a better cable modem than most modems from ISPs. As a comparison, Best Buy has it for about $99.