Try and find a pet store or an owner that has a docile, full grown Columbian Boa Constrictor and ask if you could hold it to see if that's really the route you wanna go.

I have 5 BP's. One is a baby boy. 3 girls are all around 3 and a half feet. The other is a 5 and a half foot monster man that dwarfs the 3 girls and can't be handled the same way.

So try you're best to make sure this is what you really want. If it is, I'd go with a BCI.