In case you haven’t seen Spartalytical’s note in the comments:
Just an FYI that conference tickets have gone on sale before the 12/1 date (tonight at midnight). Nothing is available any longer in the lower section for the Kansas game. I picked up a couple of other games as well and could still get in the lower section.
I just checked and there are no pairs available for the Purdue game. (I think sometimes they hold public tickets for the bigger games until later, though.)