Ju Fen (Taiwanese?) Grapes

[FattyDumplin]

Anyone know where I can get these? They are large, round, dark purple grapes about the size of a quarter around. And are intensely sweet, with the aroma of concord grapes, without the accompanying tartness. I eat these in bulk in taiwan, sometimes come upon them in LA, but never see them in new york. I believe they are a form of table grape (not sure what that means), but don't know much about them.

FD