Gosh - my grandparents used to make this back in the day. It was disgusting to my 5 year old palate, but they seemed to like it.
I don't think I've ever heard of anyone making it commercially. I'd imagine the farmland areas of PA would have some local sellers of the stuff - I've seen all kind of fruit and vegetable wines.
stopped in over the weekend and got a few bottles from what appears to be a thoughtfully-chosen selection. the place has a great look, with a friendly and passionate owner. sadly, someone threw a brick through one of the large windows last friday night. i hope that was a completely freakish one-off.