You could prob park at Haymarket park. I think its 20 bucks or something, Im sure theirs some serious tailgating going on in there. I always see RVs and what not in their. Then you can take the pedestrian bridge over the stadium.
Also, you could go to the indian village church parking lot(i think thats whats its called). Very nice group of people that coordinate the parking and everything. Its on 10th street right by the army building, just west of the devaney sports center, north of the stadium. Basically turn south on 11th at Cornhusker stay in the left lane and you cant miss it. Theirs is a ton of tailgating going on, but i would say half the crowd is college kids. Ive tailgated hear quite a bit for the games i go to. Best advice is come early, dont plan on leaving right after the game and dont use the port a johns after the game. 10 bucks to park last i knew, but i havent been to a home game yet this season so i dont know for sure.