Go for the rehomed ones
I got both of my gliders through Craig's List. Rehomed gliders are a lot of work, though. They are such shy, careful creatures to begin with, and when they have to get to know new people all over again, it takes a lot of patience on the part of both the humans and the gliders. Nevertheless, I can't imagine doing it any other way, with the number of homeless gliders out there. I have recently seen more posts on Craig's List in my area of people looking for homes for their gliders.