I'm not going to be much help here....
A friend had piece of equipment that used this touchscreen and he decommissioned the unit. I got to take parts from it! (That's why it looks so unfinished around the edges)
I assume that they could be purchased from a computer hardware specialty company of some sort. Here's the company that made mine.
http://www.elotouch.com/Products/LCDs/default.asp
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436