Prices don't look too terrible by NFL standards:
https://www.stubhub.com/carolina-pan...73/?quantity=1
You could probably go tailgate, and then 15 minutes before kickoff get one really cheap off Stubhub. (This is what I do for Mizzou games.)
Speaking of tailgate, BRC's group has an organized Chiefs fan tailgate that is probably decent.
https://www.chiefsplanet.com/BB/showthread.php?t=353423