Thanks for the clarification. 

Have a great Thanksgiving. 

Another explanation is that SA increased their annual Premium subscription to $360/year ($30/month) and forgot to update the annual subscription amount in the fine print underneath. Having said that, if the Black Friday one-year introductory offer was for $120, I would subscribe. 

Apparently, once you subscribe to Premium, you can go into your Account Settings and turn off the auto-renew option. I think that will discontinue your Premium subscription after one year unless you manually renew.