Got mine from MAN-A-FRE and they were very helpful and shipped promptly. Can't remember the cost but it is on there site. And the install is fairly simple with some basic mechanical knowledge and a big hole saw :lol:
Fat Bob's Garage had them for the lowest price (345) but they kept giving me the run around about when they would be available. So I went with Man-A-Fre too. I got mine right when they came out, so FatBob may have them in stock by now. Might save you 40 bucks. Do the install yourself and it doesn't cost a thing. It comes whit the drilling template and very good instructions, plus there are many good step by step install threads on the forum. If you have people in your are that get together for mod days, do it there. Good luck! I'm guessing a shop would want at least a few hundred to do the install.