Quite a few farms sell them in the UK but I was unable to get them for love nor money in Germany.
Or Chinese/Asian supermarkets ;) I had no trouble getting them the one time I wanted them in Stutrtgart.
I asked a Thai friend and they laughed when they heard because they are not for frying (the eggs that is)
I guess a butcher is the best guess but I just thought that with so many farms and small holdings advertising eggs (usually chicken) . .somebody, somewhere may have seen some duck eggs.
Yeh . . if I can find the ducks . . I found the eggs . . thanks for that
I had geese for many years, and I have a lot of books covering topics like duck and goose eggs. They all warn against duck eggs. I could imagine that there are strict regulations, much stricter than those concerning hen's eggs. That may be the reason why Swiss retailers do not carry them. They simply do not want to be sued by customers who have the runs.