Freezing them to euthanize them?! Correct me if I'm wrong, but since reptiles are cold-blooded, wouldn't this be one of the SLOWEST ways to euthanize them?

Ugh, I don't even have words for this kind of person. Anyone who gets into animals for the money is bad news... I'm a huge believer in karma, and I hope it hits this guy HARD. Try to get the rest of his animals away from him. Get his name out there so no one will sell him another one, or buy from him in the future. Call animal control or the humane society on him for the treatment of his animals. I'm certain they could get him on his idea of "humane euthanasia". Although I don't think he even cares if it's humane or not...