I think you'll be fortunate to get hillside tickets for this particular game.
Witout getting seasons tickets you are pretty much SOL for both the Nebraska and Iowa game. Season ticket holders (including students) have the option of buying tickets to both home and away games before they go on sale to the public. We were allowed to but a max of 4 for Nebraska and 2 for Iowa. Iowa is recently sold out to ISU fans, but I would have to say your only option for the Nebraska game is to find a friend who has bought season tickets and have them hook you up. I would help you, but I already have my 4 accounted for.
Also, if your parents or family are Alum in the College of Engineering, they have set up a Tailgate/game package for the Nebraska game.... http://www.eng.iastate.edu/alumni/events.asp