I called today to get a quote on powdercoating my rims black. He quoted me $50 a wheel! I haven't done it yet due to not having a vehicle while it's getting powdercoated. But the pictures on his website look pretty damn good, and he seemed like a supernice guy on the phone. So if you need powdercoating done on anything and live near the dallas area, look him up.
www.paulspowdercoating.com
P.S. i am in no way affiliated with this guy (i haven't even met him)