Earlier quoted context omitted.
As someone who’s not American, I’m unclear; is going to a butcher not an option? Have they been competed out of the market by supermarkets?
I don't have many butchers within 30 miles, and their selection is almost always a subset of what I can get at the larger grocers.
But unlike a supermarket, you can just ask a local butcher to save you some of whatever off-cut the next time they're trimming it. Normally they'd just throw it away.