Hey all, I'm looking for a new clipboard type thing.

I've been lead to believe that masonite would make a great surface for me to perform my sketches over, but every lumbar yard and hardware store locally doesn't have the stuff..

So I've resorted to online vendors but still can't seem to find something worthwhile.

I'm open to other materials, but can someone suggest something(purchasable online) that they use to draw on?