I had the 17" wheels on my 2000 dodge blasted and powder coated satin black a few months back. The blasting was 80.00 for all the wheels inside an outside. The powder coating was 50.00 per wheel for a total of 200.00.
With that being said depending on what they were going to do to your wheels material for paint and body can get very high quick. If they were going to have to prime and block the wheels to remove pits and such then use base clear to refinish them that can run in to a lot of time and money.
Matt