OP: I've gotten a few snakes from craigslist. All from large scale high end morph breeders, who also attend shows. I had a good transaction with 3 out of 4 breeders. They were very knowledgeable and told me to contact them for any future questions. They had very healthy, beautiful snakes. One breeder was so enthusiastic that he showed me his entire set up, process, and collection. The last out of the 4 breeders wasn't such a great experience for me. His snakes were beautiful, but came with mites. When I confronted him about he, he denied it. None of my other snakes have mites, so it was clearly from his snake. After trying to contact him various times, he just kept denying my calls. I believe he was just running away from dealing with his problems. I won't be going back to him anymore.... But I definitely would on the other 3.
Like the others have said, make sure the seller is knowledgeable, has healthy animals, and a good set up.
My area tends to rehome only males. Currently, my craigslist has around 20 males up for adoption. I have gotten some females, but they were all large scale breeders who wanted to sell locally before posting on kingsnake/fauna.