If you want a boid that stays small is easy to take care of and is dosile(starts to limit the options a bit)I could only add rosy boa(lady dragon already beat me to ahs) Columbians can stay small but there is much to much chance they will become large.Columbians do have good temperment for the most part but they will bite you from time to time(like most snakes) and are very powerful(I can't stress enough how strong a full grown Boa Constrictor can be) I would keep my eye on the snake classified's (were all posts for snakes for sale should be posted) from time to time Rosy boas pop up as do african house snakes. I hope you find what you are looking for.
“You know its funny I was thinking about what you said. The preeminent truth of our age is that you can not fight the system. But if as you say the truth is fluid that the truth is subjective then maybe you can fight the system. As long as just one person refuses to be broken refuses to bow down” “But can you win?” “Every time I say NO”