Just because you can get a baby burmese python from a friend for that price doesn't mean you should. That's a whole different decision from whether a pretty ball python is worth $100 to you. Burmese pythons will get longer than you and your boyfriend laid end to end and are more of a challenge to house, feed, care for, find rental housing that will accept, etc. A ball python can live in a 55 gallon aquarium its entire life but a burmese will outgrow that size housing pretty quickly.