Reconditioned ball lock kegs now $69 vs $59 after the new year...knew I should have placed my order a few weeks ago! Pin locks of course cheaper at $49 per. Had planned going with ball locks for a keezer build...may re-think that unless I can come up with some ball locks somewhere else cheaper.
I've just heard lots of good things about Keg Connection.
Check out AIH (homebrewing.org). They have kegs that are guaranteed to hold pressure. All you have to do is give them a thorough cleaning. These are not the prettiest kegs in the world, but I've had good luck with them and they're a little cheaper.