I bought mine online in 15D. But, before I did, I called the Box Office.
The girl was less than thrilled to talk to me. She said the only pairs available were in the South Stands (Kent State Section) or D deck. I asked about more opening up later, and she said that Kent St. returned the tickets this weekend, so there weren't going to be any more returns. I'm skeptical about that, but I wanted the tickets so I just went ahead and got them. 
I'm flying into Ohio from DC to surprise my Mom for her birthday. We were going to watch the game on TV, but since I randomly saw they were on sale, now we're going!