In addition to discounting the price of computers purchased by students and faculty, Apple sells certain computer models only to schools and universities. According to a discussion on the MacRumors blog:
Apple has quietly launched a lower cost $999 iMac for educational institutions this morning. The new low-end model is labeled "Education only" and is not available for individuals.... Apple, in the past, has also offered special education only models for institutions ... [and] has adjusted the hardware down in order to fit the sub-$1000 price point. Is Apple engaging in price discrimination in following this policy? If so, why does it prepare special models for educational institutions rather than cutting the prices of existing models purchased by educational buyers? If this is not an example of price discrimination, why doesn't Apple offer these computers to the general public?