You can search for this on ebay. Cost was $137.99 and shipping took much longer than advertised. If you are going to use Yosemite, download the updated driver from the DisplayLink website. A link to the site is included on the CD that comes with the unit, but the included driver will work only on 10.9 or earlier. Good luck on your project!

CENTURY LCD-8000U2 Black SVGA 800*600 PLUS ONE 8 inches USB 499g 3.2*21*15.1cm