Can't find any online.
Every now and then myFICO will publish a new temporary code. Look around holidays for that info. Especially keep an eye on your e-mail, on the welcome page of myFICO, and via social media.
Sign up for the free trial and make sure you cancel within 10 days. After canceling, they offer score watch at $9.95 monthly. That's how I did it.
Did they still require a 3 month minimum when you did that?