I needed coating for my exhaust manifolds. I looked into the jet-hot place, and they quoted me over $200 (included shiping and the extra cost for the finish that I wanted). So I took them to Puget Sound Coatings in Southpark (they quoted me $75). They don't do powdercoating, but they do "metalizing", so I'm giving that a shot. I'm supposed to get them back tomorrow, I'll post pictures when I do. I've used them before for blasting a metal base for a table I made, and they were pretty cool. They might even have a suggestion about where you could get powder coating done, if you are set on it.
http://www.pugetsoundcoatings.com/