Why not just use reconditioned or discarded PCs as thin clients?
This is an approach extensively used in developing countries at present as industrialised countries unload their obsolete PCs. But our discussions with government and NGOs tell us that using refurbished PCs involves a lot of maintenance, support and general hassle. A typical PC also uses about 20 times as much electricity as a Nivo, which can be a significant cost that is often forgotten.