I have posted on Davis Wiki and the facebook housing page, but there are so many other people looking for someone to be an extra roommate in their apartment, which is exactly what I am doing. I am hoping that with the incoming transfer students, it will make it a bit easier to find one. Does anyone have any other ideas?
Besides the Housing page, you should also post in either the Transfer or Freshmen Class of (year) pages. 
Uloop is also a great way to find roommates.