Like OT said, sometimes buying a used bow can end up costing you as much or more than a new one. I worked with a guy who's wife bought him a used bow for christmas. By the time he had a new string, sights installed because the old one was missing, and had the shop set it up for him they could have had a good entry level package deal paid for. My buddy bought a nice package deal bow from Dicks sporting goods a few years back. I don't know the brand (probably Dicks store brand) but I believe he paid around $350 for it, it came ready to hunt, and he's been shooting and hunting with it for probably four years now. Shoots well, and he loves it. And $350 isn't a bad price.
-Jake