From the DIA:
Sideline season ticket prices are $230 (less than $33 per game) with prime locations between the 20-yard lines on each side priced at $315 ($45 per game). Horseshoe and student season ticket prices will remain an incredible value at $99 (less than $15 per game). Single-game tickets, which go on sale on July 17, will be $50 for Big Ten contests, while the non-conference games will be priced at $25 each.
http://www.fightingillini.com/sports/m-footbl/spec-rel/022112aaw.html