Sorority Dues at Stetson range from $300 - $500 per semester. If you want to live in the house, it's only $500 more per semester than living in the dorms.
Dues usually include all of your normal fees (housing, insurance...ets.) shirts for rush, socials, and sister hood events.
The only things you have to pay for out of pocket (after dues) are formals (sometimes they will be covered), tshirts for socials (again, sometimes they will be covered) and other little misc. stuff.
Usually, everything is covered except for formal which usually runs about $45 per couple.