Beyond the top-25 teams, every sportsbook has seemingly random odds with the longshot teams. For instance, sportsbook.com, probably the most popular online sports betting site, has these Big 12 odds:
Texas 10:1
Oklahoma 10:1
Missouri 25:1
Nebraska 40:1
Texas A&M 50:1
Colorado 200:1
Texas Tech 200:1
Oklahoma State 300:1
Kansas State 300:1
ku, Baylor and Iowa State are not listed.