Buy.com has the Slingbox SOLO, which has a $179.99 MSRP, for just $134.95. The SOLO is perfect for those looking to place-shift a single device. It has component, S-Video, and composite inputs and accepts HD input, though streaming is limited to 640×480. (HD content is down-converted.)
While it officially supports one device, here’s a trick. You can connect multiple devices using audio Y-cables to share the single audio connection. As long as the connected devices can be switched off, so only one is feeding audio to the Slingbox as a time, you can connect one to component, one to S-Video, and one to composite and switch between them. So you can have three devices as long as only one at a time is on.
Disclaimer: I work for Sling Media.