Fedora 17 has a multiseat feature where you can hookup multiple keyboards, mice, monitors to one pc. If you can get more keyboards, mice, monitors, and video cards donated or purchased you could setup those 6 PC to support 12-24 (and possibly more) students. You may want to look at the Plugable DC-125 too. They are a bit over the $50 price range but might be worth it due to it's low power requirements. You might be able to consolidate some of the PCs to help with your power issues.
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Fedora 17 has a multiseat feature where you can hookup multiple keyboards, mice, monitors to one pc. If you can get more keyboards, mice, monitors, and video cards donated or purchased you could setup those 6 PC to support 12-24 (and possibly more) students. You may want to look at the Plugable DC-125 too. They are a bit over the $50 price range but might be worth it due to it's low power requirements. You might be able to consolidate some of the PCs to help with your power issues.
That's assuming you are using X on the server.