Saw this deal on r/mma. Thanks to original poster r/HungryliketheFonz as well as to Conor McGregor for inventing the sport of mixed martial arts in the first place.
Normally only get 7 days free trial with fightpass but this code will get you 30. They do ask for credit card details but apparently you can just scroll past it and enter the code without doing so and still get the 30 days. Enjoy!
Edit: Apparently some people have had issues with billing so probably best not to provide credit card details.