I don't have time to look for you, but you can try searching for "egg" or "Shell" here:

http://www.whatever3d.com/search.ez?q=egg&page=1

http://mystic-nights.com/directory/index.php

You can also search in google for things like:

Egg+3D Model              if you want free models, use       Egg+3D Model+free
Egg Shell+3D Model
"Egg Shell"3D Model

Be careful with google though. Make sure that what you download is actually from a reputable, legit site that has permission to distribute the model.   With care, Google can be a valuable tool in locating models that the 2 search links above miss.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi