I had mine done at ASAP Powdercoating up in WV. They shot blasted, powder primed, and powder coated all included for I think $25 or $30 each perhaps 10 years ago... unfortunately they're a lot more expensive now, more in line with what others are mentioning.
They did do an excellent job though, better than some other powder coated wheels I've seen.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-