The problem is that until recently you were forbidden to grow it outside the rules that the company holding the rights granted (because of the patent), which is rather normal.
Now, it remains to be seen if you can get some, since the patent seems to have expired.
But I don't know where you can buy scions.
Because as Spaugh says, it seems that nurseries still don't want to share him.
But Spaugh, can you confirm that it's okay to cut the grafted variety and let the rootstock grow to get scions?
Or do they still hold the right to forbid you to do that?
It's just a question to understand what possibilities they have to sue someone who would use their variety now that the patent has expired.
You probably know this better than I do.