I was visiting a relative near Cranford NJ and we found some at a King's supermarket. They had decent marbling, but no fat cap or point, and were maybe an inch in thickness.
I've tried a couple of "wagyu" briskets and have come to the conclusion that they aren't really worth the price. There is so much vagueness in what "wagyu" means and not being able to see before buying is a major drag.
Snake River was always considered the best, but they blew up in recent years and I think they've struggled to keep up with demand