For $5 month thru Dish Network, I get the Multi Sports Package which is all of the Fox Sports / Comcast regional networks, including Fox Midwest and Southwest, which are your best bets for getting those Big 12 games, in HD. Between that and Pay Per View like the first games other than VTech are on, and an occasional ESPN game plan day if Nebraska is on a regional ABC game that doesn't make it to the southeast, you should be able to see every Husker game that is broadcast.
I'd guess DirecTv has the same kind of package for the Fox Sports regional networks, but the only one I can confirm is Dish.