It's not that easy to get to live in a sorority house in the South. It's all done on rank: year in school, office held, etc.
And affiliating is a whole other story...there are plenty of threads on here about that.
Most sorority houses are closed during the summer, anyway- renovation time, too - gotta keep them looking nice in time for Rush!
If you are interested in in a specific school, you should just email the chapter directly...ie, UF's KD chapter is
betapi@kappadelta.org