Eggs are very complicated here in Danish supermarkets :
6, 10, 15, 20 or 30 in a package.
You have to check eggs for size, we have 4 different sizes.
Then you need to decide how you want the chickens life while laying the eggs, I think we are down to 4 types there too.
Only Aldi sells Battery eggs now, all other shops have been persuaded to stop selling them.
I prefer to visit the local farm shop and just buy 15 ecological produced eggs in different sizes but laid the same day. so Tasty