As a painter, I can tell you that the cost is directly related to the paint you use. If you use omni (a PPG line) you can have a quart of white, pint of black, gallon of reducer, clear coat, and sealer for under $200 and they are user friendly, fair quality products. If you have a decent air compressor and a respirator, a $30 harbor freight paint gun will do you well.
30,000 mile 919 survivor. No plans of stopping the abuse any time soon.