NYS Department of Environmental Conservation | http://www.dec.ny.gov/
For additional datasets available from NYSDEC, see the list of DEC datasets at the NYSGIS Clearinghouse.
1:24,000 quads data series
960 mapsheets available for data theme Elevation (10m raster)
Note that a few quadrangles in New York State that fall primarily in other states are missing elevation data -- please review current DEM data availability
If you prefer, select quad sheets by map rather than by name.