See http://www.ubcconferences.com/. They have very clean dormitory rooms with shared bathrooms, separate for men and women.
Single C$25 per night
Double C$50 per night
It is a short bus ride to the festival, and parking is available.
Reserve early. They also have multiple-family housing available.
It is also close to the very cool Museum of Anthropology (http://www.moa.ubc.ca/).