Powdercoating guns and powder are cheap. Installing an oven, a 220v outlet for the oven, my $1500 compressor, the wiring and breakers for that compressor (which is used to drive my blast cabinet) costs a lot of money.
No, I don't do mail-order coating. Occasionally I'll make a part and sell it (like my awesome valve covers) but I don't have time right now, especially since I'm so focused on getting my car done. Besides, getting stuff powdercoated is pretty cheap anyway. I'm sure you could find a place local to do it.
Paul.