if you know a painter then you can get it much cheaper than going to some place. Management at paint shops will charge you more than a regular dude would. Or what I would do is find some back alley shop or guy with a paint booth at his house and ask what they would charge. Ask to see some of their work. Chances are these guys do really quality work because they are passionate enough about it to open a shop at their house, and not just clock in at some everyday shop.