It's the summer, price will slowly go down until mid september. Then, it will start to massively grow again.
Good point, I plan on getting my whole Comp Sci dept in on a the mining when school starts back up again
I think you're going to use about 10,000W to generate one decent radeon card worth of MH/s lol. Unless you're all gamers in there, who knows
could be the autocad lab lol. But CPU only well, core 2 duos are generally around 8MH/s and my brand new i5-2400 1155 socket can do about 16 MH/s. My GTS450 can do about 40 MH/s. So unless you specifically happen to have modern model radeon cards in those PCs, it's going to be pretty power inefficient.