It's $319 shipped from gmpartshouse.com; here is the thread:
http://www.camaro5.com/forums/showthread.php?t=125029
Here are two more threads on the install:
http://www.camaro5.com/forums/showthread.php?t=151439
http://www.camaro5.com/forums/showthread.php?t=160339
I just installed it last month, and although it is plug and play, the install was a bit hairy, but prob because I'm not that technical. I had a hard time getting the 12 volt (cig lighter) out but if you follow the instructions and take your time, you'll be fine. Took me almost an hour but it looks great, the product is solid, and the vendor was great to work with.