Apparently, coroplast is called "kanalplast" or "multiglas" in Sweden. You can order multiglas from Beijers for example, but it's really expensive (about 1000-3000:- for one unit), so I'm looking for other options. Cubes on the other hand I found relly cheap at Rusta (199:- for 30 pieces) but unfortunately it seems like they won't be selling it anymore
Well, it's a good thing they have it on their webpage again, that might bring some hope! At the end of March they removed it from the webpage. When I called them I was told that if they don't have it on the webpage they're not selling it anymore. However, they did a search for me, and said that there were a few boxes left at Barkaby (Stockholm) and in Västerås. But if they brought it back online they might have ordered more, let's hope!