Check out
LA Wheel in the valley. They quoted me $110 per wheel and about 5 days to do the work. If you have tires on them, they'll even remove and remount for you. In which case they'll charge $50 to rebalance/remount. Here's Robert's contact info:
Robert Burgert
L.A. Wheel and Tire
800-584-2832 (USA)
818-626-8867
robert@lawheel.com
www.lawheel.com