Where are these kids getting snake money? If they have the money to buy another snake they should use it to buy the correct tanks and equipment for the two they have. I would tell them to ask their parents if you can look at the setup and help them correct it. Maybe even volunteer to go with them to get the new supplies. Then after they are setup in their own tanks tell them to sell the 75 gallon on craigslist to make alittle money and free up the room.

I also second Kara's idea of totes but you need to know more information about their home and heat sources before suggesting it. Do some recon and get back with us.

I would search your local craigslist for two proper tanks. Small ones are usually listed at pretty good prices.