Hi there!
In 2005 we put Planar touch screens in our exhibit at Carnegie Science Center and have since had over 450,000 visitors (over 70% being children). Only one monitor has broken since then, and that was from blatant misuse by a visitor. I personally did not purchase them, that was left to the IT department- I believe they got them at TigerDirect.com because they have a corporate account and get a discount. The general price that I have seen online is in the $450-550 range, and I would say they are well worth it.
http://www.planartouch.com/products/pt1510mx/
Good Luck!
Maria
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