It is fairly common knowledge that Apple has a forward-thinking policy about students and has always offered a great education discount. The discount doesn't seem to be explicitly stated anywhere, but is usually around 10% on hardware which can amount to decent chunk of change. What I only just discovered today is that the discount applies to teachers as well! As it happens my better half is a teacher, and our home network needs a new server
Related reading: How to buy an Apple Computer (although this article also misses out on teachers getting the discount).