Tower paint (1-800-779-6520) also does this. No minimum but the shipping cost (hazardous material) may encourage you to get a couple of cans. They do enamel or lacquer (your choice) and the colors I got were spot-on matches. Very quick response too.
You'll need make, year, and either color code or name of color (preferably both).
They're in Oshkosh so maybe you'll just drive up to get some.