You might check the “Tesla Parts for Sale” forum on this site. I bought some used OEM wheels there for my winter tires. There were some minor surface issues, so I’m having mine powder coated, mine will be a low gloss black. The cost to do that for me is estimated to be $100-$150 per wheel, depending on the amount of work they need before the final powder coat.
If you have them powder coated, you can have about any color you want.