Your best bet is to look for used ones, the dealer wants big $$$ for the wheels, about $600 for the front alone when I called in June this year.
I would post a Wanted add on this site and check ebay regularly.
I have an extra front wheel, but the lip is slightly bent on one side. A local wheel shop quoted me about $150 to repair. You can still ride on it, but you can feel the slight "flat spot" when going real slow. At higher speeds it goes away. I plan on having it repaired some day and doing a custom poweder coat, but it won't take much to convince me to sell it.
