If you do all the prep yourself, body work, taping off, etc., provide materials, and deliver to someplace like MAACO, it's gonna run you somewhere in the neighborhood of $400 to spray. I priced them recently, as I am trying to get ready for paint this Fall. I have no facilities to paint, but I can do everything else myself.
The $1k mark everyone else is talking about is not unreasonable, basically, the more work you expect them to do, the bigger $ you have to spend.
Chris