To be fair I don't even know where to buy dishwasher powder or gel. I am in the EU and have literally never seen it in any supermarket. I'd buy it if it was available but I don't think I can anywhere.
They are always available next to tablets in supermarkets here in New Zealand. Interesting to see this regional variation. Normally powders are in bottles. We get both the global Finnish brand here as well as local brands.