I found them today (what I believe to be them. i only identified them on being squat and fat) in Manhattans Chinatown at Dynasty hong kong supermarket located at 68 Elizabeth St, New York, NY, at the corner of hester. they just did a huge expansion and renovation.
the chillies can be found dried downstairs. i think theyre in the 2nd or 3rd row from the left, bottom left side. they were right beside the longer red chillies that everyone has.