I just checked on BestWestern.com and the hotel in Monticello (which is at the entrance to the field) still has rooms at $67/night for Thursday night and ~$70/night for Friday/Saturday. The Super 8 in Champaign near the mall (I-74 between Prospect and Neil) still has rooms available at $58/night through Travelocity. The Best Western in Monticello also has a Military rate of a flat $70/night for any government/military folks:
"Available to current North American national, state, county, and municipal government employees. Active and retired US military personnel and their immediate family, and employees of US federally funded hospitals and universities travelling on leisure or official business."