You're going to just have to go to a body shop and get a quote....I don't know that any shop is especially good at caliper painting specifically...mostly because it's almost impossible to screw up...everyone on here is going to tell you to DIY...
You're probably going to get told a ridiculous price
And they're just going to run to the auto parts store to pick up some $10 Dupli Color caliper paint, which you could do as well.