Zilch. Zero. Null. While you may have to purchase Arduino Esplora boards for your class - they will be yours to keep. The cost of producing the MadMaker Challenge is partially funded by the Australian Government Department of Education and Training through the Australian Maths and Science Partnerships Program.
As this is our first trial year, we hope all participants of MadMaker will be able to help in providing as much support and feedback into making this program and ongoing success for future years.