I love these, but they are nearly unheard of in the US these days. There is an orchard near us in the Hudson Valley specializing in heirloom varietals that has a few trees, but it’s tough to get there during just the right window given the apple’s short picking season. They also grow Esopus Spitzenberg, another favorite that is very hard to find around here, despite having been discovered in and named for a town in the Hudson Valley!
https://www.orangepippin.com/varieties/apples/esopus-spitzenberg