I'm pretty sure it's about $28-$32 per person, per night, to get in there. That basically covers your camping for the day plus whatever concert and other events they are having there that particular night. Weather you just want to get in for just the concert, just get in to camp, or to do both, it's the one flat fee. I hope that makes sense.
They do have their own website at
www.buffalochip.com if you want to try to find more info there.