After reading SU's tip about On On Food Co., I decided to hop in my car and check it out since it's so close to my apartment. Here's what I found out:
They sell frozen potstickers ($7.00 for a bag of 50), frozen xiao long bao ($8.00 for 50), and frozen egg rolls ($7.00 for 30).
It's located on 5th Avenue behind the now-closed Sun Hop Fat Supermarket on 12th Street (not International). There is a big clear sign above On On's door, so it shouldn't be hard to find. As SU had warned, their door was locked and lights were off when I arrived, but after some banging on the windows, two ladies in hairnets who looked like they had just emerged from the kitchen, came out to help me. As I walked away, I saw another customer arrive to bang on the window.
Their hours are:
I haven't tried the goodies yet, but I will report back. Thanks to SU for the great tip and to Melanie for the specific address.
On On Food Company
1130 5th Ave