I have made this reccomendation several times for folks that want a less expensive rack system. I have a stack 14 high, it is sturdy and works well. I am even using 3 of them to breed in this year. You can buy as many as you need and they stack right on top of each other. Heat them with heat cable, not very expensive. Heres the link.
http://www.containerstore.com/browse...1&PRODID=59860
You can easily house 5 snakes this way for under $250.