Nice monitor... but I don't think you'll find anyone willing to sell it for $550 shipped...lowest I saw was about $700... you might want to consider the DoubleSight DS-263N... same monitor actually. Some came with the A-TW Polarizer... but finding someone who actually have a "perfect" one and are willing to part with it are slim...
Best of luck though!
edit: People have sold the DoubleSight for $500-600... sorry if I forgot to mention that