$500-$600
*** This turned out a lot longer than I meant it to be, and if you're just looking for specific brand or maker recommendations, read the first paragraph and skip the rest. If you want some thoughts on how to settle on the right cue, the rest may be worth a read. EDIT: You've been on the forums a year -- this is probably a little too off topic, so I'm going to move it to a different thread. If this is your first time buying a good cue, you may want to read it. I think I may have read a few too many "I'm new to pool and want to learn, what should I buy?" threads in the past few days and it's clouding my thought process. Sorry for the hijack there.
To answer your question, I've got a cue on order with Doug Patrick, but it seems pretty rare for somebody to have one for sale and he's got a bit of a waiting list. If you can stretch a little, TWOFORPOOL has a Capone for sale at $725 that's amazing.***
You're going to get a lot of responses that say "go buy a cheap Joss/Schon/Mcdermott/Predator/etc" or "check out Varney/Sly/Ratt/LP/Crown/etc," and my biggest advice to you is to listen to them and let them point you in a starting direction, but don't just run out and buy what people tell you to. Different cues suit different people -- there are lots of different feels and hits, and your game isn't the same as mine or the poster's above or below me. What works any for us may not be right for you. If you take the time to find a cue that's well-suited to you, you'll be much happier with it in the long run, and you'll probably keep it longer before you get the fever again than if you just buy the one with the most votes.