It appears that Kevin McCormick via NANOG <nanog@lists.nanog.org> said:

Try Precision Optical Technologies who was bought recently by Belden.

They are located in Rochester, NY.

Good prices, excellent warranty, excellent customer service, made in USA, and no issues with optics for years, unlike FS.

Just FYI, Rochhester is about 5 1/2 hours from New York City, as far away from NYC as Richmond VA or Portland ME. Sounds like a fine resource, but not very convenient to NYC. R's, John