• CJR Fine Arts in West Palm Beach has many originals and prints.

• RO Gallery Long Island City,NY
   

• SeaSideArt

• Randall's

• JustFineArt

• M. Lee StonePrints

• Lyceum Collections

• Child's Gallery

• Art of the Print

• PicassoMio - Wonderful site a window where you can see the works against various backgrounds - will it fit in YOUR room?  Also versus a human figure as you can get a good feeling of the actual size.  Site is in Spanish (Espanole)

• EJS Antiques on Ruby Lane

• 
  Kerwin Galleries, 5 minutes south of the San Francisco International Airport

• Irving Amen's work is often available at eBay.

Irving Amen: A fine twentieth century sculptor, painter, etcher, silk-screen and woodcut artist, Irving Amen studied at the Art Students League in New York and at the Academy Grande Chaumiere in Paris. Throughout his career he traveled extensively, particularly in Europe, Russia and Central America. Besides practicing his art, Amen also taught classes in sculptor and printmaking at such influential schools as the Pratt Institute (1961) and at Notre Dame University (1962). His art was exhibited with the Society of American Graphic Artists, the Library of Congress and the National Academy of Design. In 1949 the Smithsonian Institution also launched a one man exhibition of his work. Amen’s famous art is now included in the permanent collections of the Museum of Modern Art, New York, the Bibliotheque Royale, Brussels, the Victoria and Albert Museum, London, and the Bibliotheque Nationale, Paris.