PiperEDU also comes at a discount. Whereas a normal Piper kit costs $300, PiperEDU will cost $250 when a school buys four units. If that price is too steep, teachers have the option to rent Piper kits on a monthly basis—two for $100 per month—and apply the money paid in rental fees to an eventual purchase.

Source: Piper Raises $2.1 Million to Teach Kids to Code Through Minecraft | EdSurge News

The kits seem pretty expensive (they have approximately $100-$150 dollars worth of components), but the support would be worth it.

A competitor (although with Pico-8 instead of Minecraft) will be the PocketCHIP, once it starts shipping in quantity.