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Duck eggs aren't that popular, we makes salted duck eggs and often have to go to the farm shops to get them as most supermarkets don't stick them, and those who do, are very expensive. Di you eat them instead of normal eggs?

When I see them I buy them, but they are more a treat than a replacement for chicken eggs. There are a couple of local butchers who stock them from time to time. Waitrose used to have them all the time, but we don't have a local one lol.
So yes it is a tasty expensive treat when I see some.