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DC power supplies

You guys get the fans from computers, you could also get the power supplies
from the computers, you can probably find old ones for free from someones
old Pentium 133 machine.  Plus I'm not sure on this but computer power
supplies deliver a ground
+12v, +5v, and something else so you may be able to hook up a switch to run
a fan on the 5 volts to make it slower and quieter and then switch over to
12volts for when you're at work or something, just a suggestion.