The paid option is at the Comfort Suites off Trinity Road. They offer paid parking and it's not a far hike to the game. Don't know what the price is this year, bt a lot of Clemson folks will be staying there after the game.
The best free option is the large lot near the NC State vet building off Blue Ridge Road. It's a bit more of a hike over flat land.
Remember that rush hour traffic will clog things up well before game traffic does. Wherever you wish to go , get there early.