zaikal: here is Maya's version.
as I understand, this, along with those of the other sisters, were some of very few pieces of art/merchandise related directly to the show that were ever sold directly, and very early on in the show's production cycle. you could get it on pencil cases and well as a couple other accessories, I believe, through some POD service like redbubble, and I don't think it would ship outside the netherlands.
zaikal: @Ye: so I went looking for this image (https://files.catbox.moe/rqpca9.jpg) referring to/advertising the custom school supplies, and it seems I was mistaken on the exact art—the one above and its sister images were actually some of the earliest donator bonus artworks, before the dedicated ongezllig petje.af was created, and I don't know that they were ever sold. that said, you most certainly could purchase the dakimakura-style art of the sisters (not drawn by massa) shown in the image attached on body pillows covers—at least more than one were brought along to the first massameet following the beginning of the show's production. I can produce at least one photo of someone at this event with one of these pillows (this may have been the same event at which the cocomelon incident occurred) and another of two f the pillows on someone's couch. this all happened early enough on (perhaps even before the official release of the first Deel, when only teasers were out) that English fans were essentially nonexistent, and again, I don't think that, if they were sold at all, these products would ever have shipped internationally. photos of them may not exist.
as I understand, this, along with those of the other sisters, were some of very few pieces of art/merchandise related directly to the show that were ever sold directly, and very early on in the show's production cycle. you could get it on pencil cases and well as a couple other accessories, I believe, through some POD service like redbubble, and I don't think it would ship outside the netherlands.