Why not just get another enclosure? You can go the Rubbermaid/Sterilite route with heat, light, substrate, hides, thermometer/hygrometer and the whole deal for less than $50. Then you can get whatever you like and just be careful to wash thoroughly between handling/feeding/cleaning the two snakes? Ball pythons aren't really social creatures, and even if you did get a second ball python to house with it, it should be housed separately for quarantine for an absolute minimum of 30 days anyway.