Well, there's Adafruit
"Adafruit Industries
80 Nassau Street, Unit 4C
New York NY 10038
Fax: (917) 210-3397
Tel: (646) 248-7822
We do not accept phone orders
Please note: We do not have a retail store, orders cannot be picked up from Adafruit."
Guess that's out.
Maybe try contacting some of these guys
"NYC Resistor is a hacker collective with a shared space located in downtown Brooklyn. We meet regularly to share knowledge, hack on projects together, and build community."
Next gathering looks to be Thursday.
I don't know if these guys actually have a storefront or not.