Keyboard with keys that cannot be removed

[ajstan]

Title says it all really, anyone know any? help much appreciated.

 

[ajstan]

http://www.virtual-laser-keyboard.com/ ?

Or for something more sensible, google 'waterproof keyboards'. There's loads of rubber ones that you can roll up and do all kinds of things with, and I would imagine that its all one piece, so no removable keys.

Thanks for your reply, but they must be cheap as possible and as conventional as possible. - For use in a school