Depends. Hi end independents, meaning folks who are truly knowledgeable and won't mess your car up, I would say 200-600 dollars, all depending on the level of paint correction needed, and hrs spent. For example, this guy. http://www.lustrdetail.com/. No relation or interest in that guy, just have heard very good things. I say search the autopia forums for good recomended folks in your area.
2013 X3 28i, AW, Chestnut, Sienna, ZAP, ZCV, ZCW, ZDH, ZPP, DHP, rear view, park distance, cargo net (Wife's)
2010 Porsche Boxster S (Mine)