Schools in the US can take advantage of Apple’s Volume Purchase Program (VPP). Every month, more and more schools are signing up for this program and using it to get a better price for ALL their app purchases.
When you use the VPP to buy more than 20 copies of an app at one time, many publishers, including Crick Software, give you a 50% discount, which is applied automatically when you make the purchase.
When buying apps for your school, you need to buy a copy for each iPad you are going to install it on (see App Store terms and conditions). The VPP makes this easy to manage by providing free tools to deploy your apps across multiple devices.
Find more details on the VPP here and sign up on the Apple website. You’re missing out if you don’t!