I had mine done by someone in Franklin Ma. That was last year and he charged $100 per wheel to prep (sandblast) and coat for a single color. Let me know if you want his info.
Went there when I was looking to get mine done, they wouldn't touch them though because they were chrome. They didn't want to deal with stripping them. Looked like they did some nice work though from stuff sitting around the shop!
They powder coated by Mopar CAI red and it came out great.