On-campus housing is difficult to get for I believe about 18 months, unless you know someone living there who needs a roommate. You can check craigslist.org for availabilities, and there are a lot of apartment complexes close to campus (< 2-3 miles) that have vacancies. If you're willing to share a room, you can get a place pretty cheap, and 2 bedroom apartments run approx. 1400+ from what I've seen. To me, $700 a month isn't bad after living in Berkeley but I know people who think it's a fortune.