There are a total of 20,000 Gods Unchained tournament tickets in circulation, with no more to be released.
To see if tickets are still available and to purchase a ticket, go here: https://gu.cards/tournament-tickets.
Tournament tickets can also be found at https://gudecks.com/marketplace/passes - so keep an eye out!
Once you’ve purchased your ticket, you’ll be able to access it via your browser wallet. If you want to transfer tickets to a different wallet, follow the instructions here: https://medium.com/@immutable/how-to-access-your-tournament-pass-c4ecbd3fb2d5.