The best way i know to get season tickets is donate to the Buckeye Club. Thats what I did. The levels of giving start out at $1500 for a year. This basically entitles you to buy 2 season tickets to home games. The more you give, the better your seats/ availability for road games/ post season tickets will be. You have to donate $2500 to get the availability for said road/post season games.
The cost of tickets is in addition to the cost of donating.
Let me know if you have any further questions.