I'd say go to the dealer. They are between $90-$110, I believe. And you should be able to hook it up, I think it just needs power to it, and then the switches will work. The only thing is, you'll probably have to either modify your dash to make a cuppy hole for it, or just mount it under it. But it should work, at least that's what I was told by my srvc dept, when I was first searching for my truck, I found several in the config that I wanted that didn't come w/ the switches, and they said it was simple to put them in.
-BG06.