X3I love my Costa Rican BCI. Caulker's Cay boas can also be a good choice and they are very slow growers. There are also two Mexican boas that are dwarf species. The Tarahumara and Tamaulipas are considered to be the smallest of the dwarf boas, but they can be hard to come by. Nicaraguans are probably the most readily available. Some of the others are Costa Rican, Panamanian, and Sonoran.
Especially at feeding time...
And they are strong for their size. I swear I think my Dumerils does the P90X workout at night...