I can find lots of DVDs at my local Carnegie Library where I found The Squid and the Whale, one of the best movies of last year. Was it last year? This movies has one of my favorite actresses, Laura Linney. It's about couple of New York writers who are getting a divorce and get their two boys involved. Lot's of head games are played and the two boys get seriously messed up in the process. One caveat, there is a really weird scene about one of the boys displaying some really odd behavior for a boy of 11? played by Owen Kline, son of Kevin Kline and Phoebe Cates. Well worth seeing, although some founded it depressing. I enjoyed the zingers.
If you are into mean and funny dialogue another movie you might enjoy is Notes of a Scandal where Judy Dench brings verve to the art of insulting someone.