I did some researcher for the American Hot Dog Eating Contest and found best value on Female winner under 38.5:
Miko Sudo past results:2018 Contest 37 1st place
2017 Contest 41 1st place
2016 Contest 38.5 1st place
2015 Contest 38 1st place
2014 Contest 34 1st place
Miki Sudo twitter:
https://twitter.com/OMGitsMIKI/status/1144960386401095681
I searched all these sportsbooks and Sportsbet.io had the best odds for this prop:

I also made a 2 bet parlay for both Miki Sudo and Joey Chestnut to win
