Shell Sculptie (Help!)

Someone please help me! I've been trying to make a very specific sculptie shape, and frankly, am about to pull my hair out. Could anyone please please help me make, or sell me, a scultpie shell? I'm looking for the type of shell commonly used to make jewelry, that decorate trinket boxes and the like. Cowrie shells, they're named, here's a link to a pic. Of course, any other shell like sculptie maps would be great!

http://www.seashells.com/bulkasstseashells/ringtopcowrie.htm

Thanks!

What part of the shape do you need? You could make a cowrie shell from a slightly egg-shaped sculpty and create the jagged opening with a texture.

Is it important to duplicate the entire shape, opening and all, or could you use a simpler shape and texture it?

Thanks to all who contacted me in world, I now have different kinds of shells, all of them fantastic, thanks soo much! I hope to be putting up what I'm making with them soon. ))

Oh! I would love to see/buy some shells too. In my case, I want to put them on the sand by the beach, so they'd have to be mod so I can make them larger than for a jewelry box.
Also looking for a lobster and other sea creatures, low prim preferred.