Licensing is always a huge misconception. People assume that you can buy a single license and run it for many users. This is not the case.
I sell a range of virtualised solutions that could possibly assist you. XenDesktop, a Citrix product for desktop virtualisation, can run Linux machines on a thin-client (essentially a dumb terminal). One of the advantages of a solution of this nature is that it is easy to manage. You essentially create a single image and push it out to each terminal. If something packs up on the terminal, simply reboot and a fresh, working, image is pushed down.
Cost of the Citrix software and terminal is around 1/3 the cost of new PC with AV, OS etc. TCO of course is far, far less than traditional PC as the terminal has no moving parts that can break, and the OS cannot be changed by the user, which means less support required at the desktop.
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