Search facebook pages for breeds you're looking at.
Craigslist has a bunch of dogs as well.
Last time I went to the shelter most everything was pitt x ****.
If you're seriously looking at a hound dog do some research first. I have a redtick coonhound and you have to be on top of training them from day one. Hound dogs in movies and country songs are normally described as lazy dogs that sleep all day, that's far from the case.
The "prison" dogs I've encountered have been some of the most well behaved dogs I've ever met, however you need to learn the commands and expectations that were given to the dog to keep their good habits intact.