The materials bill for teh repaint on my Fiat 9which i did myself) was about $500. When I had a shop of my own and was buying the materials at fleet prices, it was about that for enough to do a larger car. With inflation for teh last few years factored in, figure fleet cost for the materials at about 800 or so for a firebird for OK, but not high end, paint. Add labor. I used to do complete repaints in one color for $1800 using PPG urethanes. That was 10 years ago.
Prep is everything. even if it doesn't need bodywork, it will need to have the surface prepped properly, which included removing all the trim and the like, preping the door jambs, hood and trunk jambs, etc, thorough sanding, priming, block sanding the primer to make it level, final prime, scuffing, and paint (in your case, two colors PLUS the metallic should be under a clearcoat). To do it right should take at least a week, if not two, at a normal shop.