Erm, bit stuck on this one, how do I sell the egg? Can't work out how to select that option
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ah, the eggs are not meant for selling, but only as a gift.
The "sell" button outside the shop is a bug, it's supposed to show you "Gift" along with the number to press for using it. You can't gift everything, but only certain items. So to gift e.g. the first item, you press the "1" key.
Sorry for the confusion!