In Apple's place, Google with its Chromebooks have stepped in. Chromebooks are cheaper, easier to manage, and easy to share between students. The low upfront price is a big factor, but there's far more.
For example, Google offers programs just for schools, Google Apps for Education Suite; class-specific ChromeOS and Android apps, and Google Play for Education. Chromebooks that come with Google Play for Education range at prices from $199 to $227.