I realize that reptiles don't usually get equal treatment from animal welfare groups. (Yes, I know what a can of worms that is, but hear me out!) If the conditions the snakes are being kept in are deplorable, then report him to animal control. I know you just want to rescue these animals and I think that it's absolutely wonderful that you are going to the effort, especially when you are pregnant yourself. I just hate the idea of giving money to these kinds of people, and get so frustrated when I hear about people paying money to bad breeders or pet stores to "save" an animal by buying it. If you go to see a purebred puppy and find a puppy mill, don't get out your wallet, get your phone and report them!

Oh, and I almost never look at the reptiles section of Craigslist anymore. It just tears me up.