The three editions of kantoor are sold out with me. The staalplaat shop in Berlin also sold all of their copies of Kantoor 1.
Kantoor was released in cooperation with Petrichor Uitgevers in Deventer, the Netherlands. On their website you can find a list of authors. There you will find some of the kantoor artists. The best way to buy a copy is to get in touch with them or with petrichor.
The preparations for the production of kantoor 4 haven’t started yet.