Here are some of the industrial suppliers that I use in Atlanta. I think most of my impact stuff came from Ziegler. Any of these companies in New York? Snap-on also has allen drivers, but I don't think they are as stout as the Apex.
http://www.grainger.com/Grainger/wwg/start.shtml
http://www.mcmaster.com/
http://www.zieglertools.com/
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