Yes, that's quite a problem, because Digitec doesn't offer any. I recommend ordering from Aliexpress, it takes a little time but you can order a few filters at the same time. In my opinion, the Xiaomi G10 would be even better than the Dreame V11, because it is practically the same product, but marketed as a Xiaomi product. It also comes with a mattress brush and even a wet wipe function. The Xiaomi G10 costs less than 260 Swiss francs and also has an automatic mode that recognises what you are vacuuming on.

Xiaomi Mi G10