The Strand – in the East Village and downtown near Wall St. A maze of used books. Wonderful selection. http://www.strandbooks.com/home/
828 Broadway (at 12th St.) New York, NY. 10003-4805 212-473-1452
95 Fulton Street (3 blocks east of Broadway) New York, NY. 10038-2803 212-732-6070
NYU Bookstore Lots of great film books - artistic or business focus.On Washington Sq. Park. http://www.bookstores.nyu.edu/
Barnes & Noble These giants claim to have the largest bookstore in the world. I have been there... pretty huge... I recommend it... on 5th Ave. @ 18th St. Or, the one on Union Square North is pretty large... http://barnesandnoble.com/