Right now is probably a good time to start looking for people to write you recs! Use all your contacts and ask around to see if anyone you know is a sorority member from one of the sororities on your campus. If you can't find one for a specific chapter, you should start looking for a local Panhellenic organization to try and get recs. They don't need to be sent out any time too soon, but looking for people to write them will save you a lot of scrambling at the end.