if you're looking for decent seats, a scalper may be the way to go. They do have tickets at the door, but you're looking at the top row of seats I believe.
It looks like you can get as low as row 20 behind the basket for $5-$18. Sideline are just about full. Corner are half way filled. At hawkeyesports dot com you can pick your seats.
Go and buy the cheapest ticket you can, then find a lower seat as there will be plenty of empty ones. I have season tickets on a side in row 13 and there are always empty seats around me this time of year.