App Store Volume Pricing
Apple have introduced a nifty program where developers can sell their apps to schools and colleges in bulk for a 50% discount:
The App Store Volume Purchase Program makes it easy for education institutions to purchase multiple copies of your app.
You can choose to offer special pricing that is 50% of your list price to education institutions when they purchase 20 or more copies of your app. You have the option to apply this special pricing to all of your applications or only individual applications.
It's a great idea, although I wish they'd give developers a little more flexibility in setting the discount rate. Also, I wonder how they're going to determine what counts as an education institution; typically, Apple use university email addresses for verification but this would be fairly cumbersome for primary and secondary level institutions.