Nintendo ne compte pas se faire des marges ou beaucoup de fric sur la partie en carton:

Note that the kits will not be mandatory - although the cartridge is needed - since Nintendo plans to offer the cardboard design pattern for free for aspiring builders

http://www.nintendolife.com/news/2018/01/nintendo_confirms_it_wont_be_freely_supplying_extra_cardboard_replacements_for_labo