If the person is in your area and doesn't have to drive far. I'd offer them $100 - $150 and see what they say. Especially if you can give them more work in the future.
It varies depending on demand (and unions). I usually try to throw em 250 bucks. In return I demand same day turn around. They guys I use are awesome. I can offer contact info if interested. They are always just an email away.