I know a shop where the little solid "chocolate" eggs with a hard coating are available year-round (they're spotted too, though in a different sense) but somehow I feel these are a sort of cheat in the context of your quest. Also the stuff they are made of is so inferior I think they should be discounted on quality grounds.

I don't expect to see a real Easter egg for, oooh, days yet, just before the next halloween masks.