Want a quality stereo viewer?  In my opinion the Owl viewer (version 2). This modern viewer replaces the classic stereo viewer and it folds flat for travel and storage!  I purchased these personally from Brian during the 2012 National Stereoscopic Association convention.  To purchase these from Brian's site Londonstereo.com will cost you $47 (at current exchange rate) each to purchase and import to the U.S.  Due to this special purchase I can offer it for $30!The OWL, designed by Brian May, is a unique, high quality, stereo focusing viewer, which packs into a space only 6mm (1/4 ") thick, yet assembles in 15 seconds into a rigid precision instrument which is equally at home sitting on a page to view stereo illustrations in a book, or used in the hand as the perfect viewer for stereo cards - classic or modern.