those Nova slotted print processors are pretty efficient. i would definitely consider getting one of those for volume printing like the yearbook. they don't take up a lot of space, either. i think they're a couple of hundred dollars, though, and you have a get the size for the prints you're making.

(you attach a clip to the paper and slip it vertically into each of the slots in turn, and agitate by moving it back & forth in a circular motion while you watch the timer.)