Fountain Pen Hospital
A long standing pen shop in Downtown New York City, just off Broadway, on the R line, close to the financial district, the Staten Island Ferry, the former site of the WTC, and City Hall, the shop carries most brands of pens, and has a fairly good range of vintage pens. They are price competitive, and offer repairs. They also carry fountain pen accessories and inks (including Noodlers).
Some of their sales items are unmatchable elsewhere and the sales pages should be checked regularly.