I can't recall what it was exactly, but for 4 rims I had priced it was gonna be close to $500 total. That was with me dropping the rims off as is...If I prepped them, it would have been closer to $400. Most of what you are paying for is the amount of work they need to do, so if you save them time, they save you money.
Okay, scratch that...its been a while since i got that priced...i just did a search for it and found a company that'll do it for $180-$220 for all 4.
http://www.powderperfect.com/pricelist.asp
That sounds a little more reasonable...