Duck eggs?

Supermarkets don't usually stock them as they tend to come from small scale suppliers. F.X. Buckley butchers in Dublin certainly used to do them, not sure they still do. Butchers and 'artisan' food shops may be your best bet in cities. A grocers in smaller towns may have a local farm supplying them. If you're in the country, ask around.

Try the Asian markets or the Irish green grousers. some of them do eggs, raw cream, raw milk, and other 'real' foods. Also ask your local butchers. They do eggs.

They're white, they can also be blue, green, slightly pink and sometimes a slightly grey tinge as well