The local humane society - they're on petfinder just like thedarkwolf posted.
Great dogs - Douglas a 2 y.o. walker hound, and T.J. a 6 month old lab/walker hound mix. Think someone mistreated Douglas a bit, but he's coming around. And overall they are some of the best dogs we've had.
The local one here, you can even leave a "wanted" card with specifics for what you're looking for. While we were there they were intaking a puppy that matched what someone wanted. They were calling them before the original owners left. Though, I REALLY want a English Bulldog. The manager has seen 1 in the past 5 years. And told me flat out if they got 1 it would be going home with her or one of a couple of others there that want them.