In order to make a computer into a firewall, all you really need are a CD drive (to load the OS), two network cards, and then the basic stuff (motherboard, RAM, CPU). You don't even need a harddrive - though in that case you'll want a floppy drive to store configuration data on.
You can get "OS on a CD" packages like Knoppix or Smoothwall and boot the computer with that and set it up.
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Eat antimatter, Posleen-boy!
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