I paid $100 for my first tank (40 gal) and about another $100 for everything in it. After that I went DIY rack. Less than $100 and currently housing 4 snakes. Probably spent another $50 on tubs, water bowls, and hides. I have extra tubs and open rack space, so I could house 2-13 more snakes, depending on size.

So $150+ for my pied and $26-45 for the others. It'll be even less for future snakes since I already have all the supplies.