Sling Media Slingbox PRO-HD SB300-100 for $229.99 shipped.  Here is a screenshot for your reference, along with a video overview of how this device works.  It streams high definition video around the house or over the Internet using an existing home network and works with most existing HD DVR, satellite receiver, cable box, and more.  It is compatible with over 5000 devices.  Most places have it for about $264 or much more.