Actually, it should only cost you $365.97. Maybe the $500 a piece includes tires. But I doubt that, since a salesman will quote you the dealer asking price. The lower figure I quoted you is the wholesale cost (I believe).
chromaplast... how come you need new rims? And how many do you need? I have one that is practically new (a 1/4" nick - barely noticeable) that I would part for real cheap.
If I were you, I would put out a "wanted post" on this forum page. There are a lot of people putting on 18" wheels that might want to sell their stock 17s. I picked up 4 - 17" rims and Potenza tires for a real good price. They were practically new (130 miles on them).