Computor developments are being followed with interest and with some understandable apprehension by the companies that now supply the bulk of the business machines in use.

ECONOMIST: The business world

To make things fair, we chose regularly replenished items that all three retailers sell, and we didn't include sale items. (While there are back-to-school sales galore right now, January is prime time for office-supply sales.) To bake in the effect of bulk purchasing, we chose 10 of the largest package of each item.

FORBES: A Penny Pincher's Guide To Office Supplies