All of them are non-venomous, but there are a ridiculous amount of ball python breeders out there and animals in need of homes. I actually worry that some of the wild type ball pythons might be euthanized for no demand. Similarly, there are more retic breeders than people who can house them (aside from super dwarf localities) responsibly.
I think boas don’t have quite the same over breeding problem as balls, but it’s not hard to find one needing a home. Snakes live 20+ years. It’s a big commitment.