This describes Apple's Policy
http://www.rixstep.com/1/20070604,01.shtml
They have no site-wide licensing policy, which makes upgrading clients EXTREMELY expensive. This needs to be addressed.
This seems to contradict the experience with Apple that the educational institution I work for has had. We're currently in our "Hardware Purchase Cycle" where everyone who has been looking to upgrade computers or acquire new hardware is encouraged to do so now to maximize savings as part of a massive group buy. HP and Dell are participating, and Apple gleefully jumped in as well, giving us discounts for hardware and OS upgrades beyond the standard educational markdown.
The purchase cycle extends not only to "on site" hardware, but to faculty, staff and students making personal purchases as well. Though, Apple and the other vendors
very thoroughly verify your affiliation before giving the discount, even going so far as to tie into our institution's LDAP servers to check against the enrollment and employment rosters. The LDAP lookup happens before you're even given the link to the online store. If you don't match up in the databases, you're not even shown the prices.
I won't say how much I got my MBP for when I bought it as I'm not sure if there are disclosure restrictions, but I will say it was cheaper than the closest equivalent laptop I could build on Dell's or HP's site, even with their discounts. OS X upgrades were very heavily reduced too.
I should note though, that Microsoft did counter with a negotiated site license of their own: the university paid one lump fee, and now every department can use Windows XP, Windows Vista for Business, Office 2004 for Mac, and Office 2007 for "free." As in, no additional payout required. Supposedly this will extend to the next version of Office for Mac as well. The catch: you can ONLY use it on site. Though "work-at-home" pricing is available. Not many people have taken up the offer for Windows Vista though.
I guess what discount you get from Apple depends on how much buying clout you have. The institution I work for also aggressively negotiates discounts with hotel chains, rental car companies, airlines, restaurant chains, insurance companies, banks, and all three major wireless phone carriers, so I imagine they have a lot of clout.