We had family come to town for the 2015 game. Rather than buy tickets through the U we got them on the secondary market (Ticketmaster I think?). We were 3rd row 50 yard line on the West side. Great seats, and iirc they were cheaper than from the U ticket office.
This year may be different though since both teams are good.
Where are you planning to stay? Getting out of the area can be a challenge after the game. People have been reporting 1 hour plus wait times to get on the Link light rail, for example. And Uber/Lyft are slow as well.