Hey everyone,
I was just at Circuit City and I picked up one of the XM radio/GPS/whatever metal mounts that mounts on your dash by the radio for 10.99. It's one of the cheapest prices I've seen for it. Everywhere else I've looked it was over 20 dollars.
Here's the company's website:
http://www.bracketron.com/xmain/index.php
It's vehicle specific for the Liberty. The website says 2002 - 2007. The box says 2002 - 2006, just probably not updated yet.
It looks like you pull off the dash bezel around the radio and drill three 5/64" holes where the holes are in the mounting bracket, screw it and then put the dash bezel back on. It comes with the bracket, mounting screws, a wire clip to hold the wires behind it of whatever you're using it for.