Newegg.com offers SiliconDust HDHomeRun Prime 3-Line Digital CableCard HDTV Tuner for $99.99. Shipping is free.
HDHomeRun PRIME is a TV tuner for Ethernet-attached computers. Once it is connected to your home router, you can access the HDHomeRun PRIME tuner from any computer, anywhere in your home. Watch or record TV from your family room, kitchen, garage, backyard, or anywhere you have a computer.