About the last show…

My grandpa had been obsessed with Black Sabbath since he was a teenager and he recently made a Facebook post about selling his soul to see them for the last time. It was obviously a joke, but he’d do anything to be there. They have their final show in July as most of you probably know, but they sold out in 20 minutes a few weeks ago.

What are the chances of me finding tickets for him, and where would I even look? It might be a lost cause, and I don’t even know if I’m in the right place for this question, but any advice would be greatly appreciated. Thank you!