If you are working in the Garment District, you probably have visited 7th Avenue Stationers. They are located on 210 West 35th Street and of course on the 7th Avenue. I regularly buy my Pantone color swatches from them, and they have much more to offer.

You can also shop from their website www.7thavenuecollector.com  

If you need special pricing, call Eli Murad at 212-695-4900