Or if you don't mind sitting among the home fans, you can get seats off 3rd party sites like Seat Geek or Vivid Seats. Probably want to stay out of sections 4-8, though. Those are the Student seats. Section 39 is designated as Alcohol-free.

We got our seats in Section 1 row 31 behind the west Endzone from Seat Geek, for about $11 cheaper each than you can get from the Oregon ticket site.