Ron and Ryan, you might consider checking with a local tire shop that specializes in eighteen wheelers. Most of these shops provide bead blasting and powder coating for the wheels of the big rigs and will do your rims for you. If they don't do it, they can probably refer you to a local shop that does. Some shops do the work in house, others send it out.
I have paid a low of $7.50 per wheel to a high of $25.00 to get this done at the big rig tire shops. They can also provide commercial heavy duty metal valve stems, which are much better than ones found in 'car' tire shops.
The shop that did the wheels for $7.50 had one color--white. That's what I wanted anyway. The $25.00 shop had a choice of various standard colors, all for the same price. They were also willing to do a custom color for an additional charge.
Good luck,
Matt
