I just wanted to add that I was in Oxford last year (not for Oxonmoot), and stayed at the Peartree Travelodge. It was nice, and very cheap for a hotel as opposed to a hostel (we booked it over a month prior and got a sale). Not sure how much it costs normally, but it's certainly better if you're not traveling alone (paying for a whole room for yourself). Bit of a longer bus ride to and fro Oxford center, but we were satisfied. Watched the Zidane-headbutt Cup there.