The Mini dealer itself wouldn't repaint the hood. The dealership would send it to their own, separate body shop or a recommended one. You'd be better off getting quotes from various body shops to have it redone. Just remember, the cheapest bid, isn't always the most quality. Do your homework by researching a shops work. If I was to throw a number off the top of my head though, I'd say you'd be looking anywhere between $300-$500.