Apple has informed Mac developers that it is preparing to launch the ability for educational institutions and developers to purchase apps from the Mac App Store in volume for a discount. The upcoming feature was announced in an email:

For orders of 20 copies, a discount of 50% to the total order will be applied. This option will not be enabled for developers automatically, but the app sellers will need to enable the feature in iTunes Connect.

You may also offer a discount to educational institutions for multiple purchases. If you choose to offer a volume discount for an app, institutions that purchase 20 or more copies of that app in a single order will receive a 50-percent discount.

Your existing Mac apps will not be automatically enrolled in the discount for educational institutions. If you would like to offer your existing Mac apps at a discount for the Educational Volume Purchase Program, check “Discount for Educational Institutions” in the Rights and Pricing section of the Manage Your Apps module on iTunes Connect.

Apple launched volume purchase functionality for iOS applications in 2011.