Linksys Advanced DPC3008 DOCSIS 3.0 Cable Modem for $44.95 shipped. Here is a screenshot for reference. It has IPv4 and IPv6 support and speed up to 340Mbps. Having your own cable modem often means you do not have to rent one from your internet service provider (ISP) with a monthly rental fee, which saves money in the long run. Most places have it for about $65.