In case you're planning on going to the Duke game and don't have tickets, you can use promo codes "clemson" or "tigers" and get seats for $30 and $20, respectively. Yeah, you can probably pick some up for $10 on the day of, but $20 for a confirmed ticket in advance so you can focus on tailgating on game day instead of looking for scalpers is a pretty good deal.
In case the link below doesn't work, just navigate through Duke's ticket office website.