Depends on how early you get there. Most lots that allow public parking fill up fast near the stadium. Most of those will be $20-30 to park, there are a few places up and down the strip, including the side streets. I've parked across Henley before it was re-done, not sure if still can, it was $10 over there.
There is free parking at the State street garage close to gay street, it will be full early. There is a shuttle that picks up at Market Square, it's $5-$10 for that. There is also a shuttle from the coliseum, it costs to park and also to ride from there.
I'm sure there is more, that's basically the ones I've used.