DS - The catalog from ACN has a " Red Yorking " - a sport of York - in it. They describe it as a premier processing apple. I have to think if York was a popular apple, ACN would be propagating it. ( Not trying to argue your point !! :) ) I've not even heard of it spoken about here, but then many GOOD EATING apples don't make the grocery stores or become public hits. Your description has me curious now, so I'll have to ask around. Some smaller and hobbyist growers raise off-beat and uncommon or older heritage varieties. Maybe I can locate some.
The most easily found apples at orchards in Central and Eastern Pa. are : Macintosh, Cortland, Northern Spy, Winesap, Empire, Idared, Macoun, Honeycrisp, Golden Delicious.