Here's a list of all the thrift stores I visit most often in Manhattan!
Salvation Army
Kips Bay
Address: 208 E 23rd St, New York, NY 10010
Chelsea
Address: 208 8th Ave, New York, NY 10011
Hells Kitchen
Address: 536 W 46th St, New York, NY 10036
Goodwill
Upper East Side
Address: 1704 2nd Ave, New York, NY 10128
Upper East Side
Address: 1114 1st Ave, New York, NY 10065
Union Square
Address: 7 W 14th St, New York, NY 10011
Harlem
Address: 2231 3rd Ave, New York, NY 10035
L Train Vintage
Address: 204 1st Ave, New York, NY 10009
Buffalo Exchange
East Village
Address: 332 E 11th St, New York, NY 10003
Washington Square Park/ NYU
Address: 714 Broadway, New York, NY 10003
Chelsea
Address: 114 W 26th St, New York, NY 10001
East Village Thrift Store
Address: 186 2nd Ave, New York, NY 10003
Housing Works
Multiple locations! See here
Designer Revival
Address: 324, 1, 3930, E 81st St, New York, NY 10028