If it's just a pair it shouldn't be too hard but you'll be forced to buy them on University grounds or you'll get scalped.
Face value is $85 a seat which is ridiculous but I shelled out for it because we really wanted to go down and support the team. It also helps we have family in Tulsa and the game wasn't televised but we went down there in 2003 and of all the away trip destinations Ostate is one of the more friendly and safe places to go see an away game.
Advice, NEVER EVER go to Boulder. Just don't. Columbia is a close second.