We have several sheets of Slate from the Old School House Chalkboards. They are in 2 thicknesses and in a couple large sizes. 
Forget the chalk paint!  Real Slate provides the best results! Recycle & reuse for the BEST!

You can cut to any size with a special blade and have mutipules...

These would make wonderful chalkboards for the kids or a message board in the kitchen.  Craft projects or sandwich boards.  Anything your imagination desires!

These pictures were taken before the slate was cleaned.  A damp rag does wonders.

Call with your questions or to make arrangements to view.