On Ebay, type in "Chrysler 300M", and you should find many different things including wheels. On the last one, enter in the information for 99-00 if you want the Razorstars and 01 if you want the new design chromes. I think it's a little over $600. They send you the new chrome rims and you send back the silver ones.
Ebay tends to have different auctions for chrome razorstars often, sometimes for a really good price. Check it often. There are also other sites, just go to a search engine and enter "chrome wheels".
Worth looking into. I already have those, so not interested. But I was looking for some other stuff. Thought there might be interest.