I found this store years ago in the Altstadt (Old Town) of Salzburg. All they have are hand-painted eggs with different motifs for all kinds of holidays or decorative purposes.
The prices are from 4 Euros and up but so worth it.
Here are some more examples:
I have never seen a store with so many eggs! If you ever have the chance to go there, do it! I went back 3 weeks ago and was hoping to find an egg with a painted image of Mozart on it, but no luck there. They will have them again, but I might have to go back in November and try my luck again. I own a few eggs but always left them in Germany for my mother to take care of. I didn't want them to break during the flight back to the states.
Have an 'egg'-cellent day! ; )