Looking for a decent 390xp, not too hammered, power head only, at around $500.00. I know that's a little low, but if it needs some work that is ok. Please let me know if you have something.
Bill G had 2 listed a few weeks ago. He didn't have a price listed buy I would guess he'd be close to your price range.
heres a link to a pretty decent 394 on AS http://www.arboristsite.com/community/threads/husqvarna-394xp.280557/