Does your university have accommodation Facebook pages or something similar on Facebook. Sometimes people drop out of their accommodation and advertise rooms going spare on these. You could ring the university accommodation office and ask if they are aware of such Facebook groups if you don't know any. You could ask the accommodation office if anyone has dropped out of anything in terms of student accommodation that they are aware of and ask where you could advertise for something. You could contact all the letting agents/landlords who tend to deal with student accommodation and ask if they know of any students still looking for someone to join them and ask them to let you know if they become aware of anything. I would keep ringing student letting agents regularly and search daily.