Yahoo Sports, just $4.95 a month to get ISU football games on the internet. There is a link on Cyclones.com under audio I think. You can get the audio and gameplay which tracks each play, player stats, etc.
not sure if y'all saw the earlier post, but go to http://www.kmakkbz.com/kma/ and click on "listen live" in the upper left. courtesy of kma in shennendoa, ia.