To start the hunt, I offer to you...

Some of the best Flea markets in NYC...

P.S. 321 Antique Flea Market
This neighborhood market offers a wide selection of shabby-chic furniture, clothing, and kitsch.

The Annex Antique Fair and Flea Markets
Expect the unexpected at Chelsea’s surviving outdoor market, whose longtime venders reliably unearth one-off treasures for flea-bitten fans.
125 W. 18th St.

and throwing in one that is more special since it does not occur all the time...

Armory Antiques Show
Twice a year event featuring dealers from all over the world.
643 Park Ave.