Hi! I bought it from a store in the Netherlands called Pipoos. You can also find the author selling her books on Amazon. She is called Karin Luttenberg, or also goes by Paperfuel.

Hi Julie! I bought it at a local shop in the Netherlands. You can also find it on Amazon.nl (and maybe other Amazon sites too, she has some other books available on the American site), if you search for Karin Luttenberg and the title “Paperfuel Doodlekleurkaarten om te versturen”.