Here ya go. Call a company in the phone book. Tell them you want your bathroom painted. They'll send out some 18 year old kid to do the small job. When he's done, tell him you'll pay him $xx.xx an hour to do your entire house on the side. Just guess what he's making, and go up $2-3/hr and the kid will be thrilled.
Otherwise, like Pete said, you're looking at over $2000 for a house that size, with color. I used to paint, and would be asked by customers to do jobs on the side for more than I was making. Good luck though, cause you're looking at a week+ of a rearanged house if you have a small crew working on it.
Also, are they painting all of the trim? That's the most time consuming part of painting. I personally don't tape anything off, as I've got a surgeons hand when it comes to cutting-in with a paintbrush. Maybe you could do some prep work?
Mark