It depends on your school. The best deals involve sales inside college campus computer stores, where you can get Office for around $30, but you have to teach or attend that college. However, almost every school has some kind of discount deal that is typically much lower than the generic education cost of around $120, for example, my wife teaches at a community college and they have a deal for around $50. So it totally depends on your school.
But just to emphasize, beating the retail education discount is an institutional membership kind of thing - you can't just walk into a school you don't belong to and get it.