I think Web-Legal is about the only one still selling any variety of stories. A couple of others used to, but have stopped recently. (Mine are there under Silky Delight). Our resource section also shows Sex Story Content -
http://sexstorycontent.com/. I have not tried them, but I may well check them out.
What kinds of stories are you looking for? What niches? Hit me up and I may well be able to help.