You have the option to download the free PDF file that comes with all the cards needed for playing SudoHopper3D® (the PDF file is in the attachments in the first chapter of the free course). The PDF is a DIY (do-it-yourself) project in which you'll have to download, print and cut the cards yourself in order to play. 

You also have the option to order physical cards online from Make Playing Cards. The price of the plastic game cards is: $62.50 + shipping.