20 snakes -
14 balls, baby dumerils, adult dumerils, BRB, yearling burm, and two 7 foot burms.

2.6 rats, each female consistently puts out 12-16 babies, I spend about $20 a month on food, about $10 a month on bedding. We're lucky to get huge jumbo rats from a friend who has a big rat barn, but only keeps balls. So when his breeder males are retired, he doesn't have any snakes large enough to eat them, and we get them for the burms =)

I live in an apartment, but my deck is just large enough to house all the rats on. Once it gets colder again, I plan on moving them into the outside storage closet with some heat, so I don't have to deal with the smell inside.