I don't know of any places that you can get rent for $600/mo. They must be in a State where it is cheaper to live. Maybe they live in the desert with $0 for heating. But in the winter, the desert can get pretty cold and they would still need a/c.
Maybe it is in Florida.http://average-rent.findthedata.org/
Oh wow...rents in some areas of Florida are so cheap. It must be Florida.