UPDATE: Nintendo Australia has confirmed to us that this is not the case. They’ve provided a pretty reasonable solution to those who might damage their Labo cardboard bits a long the way.
“We recommend holding onto the cardboard sheets, even after the pieces have been removed from them. Later, the removed pieces can be used as stencils to trace and cut out spare parts from the empty bits of these old sheets.” said a Nintendo Australia representative.
Nintendo has apparently revealed to IGN France that you won’t need to buy the Nintendo Labo kits. They will instead offer free cardboard designs that we’ll be able to download.