I was looking at the Sword +1 blog about mapping with a 11"x17" bienfang pad 8x8 squares and then I remembered. I still have this;
Its a left over desk blotter from years ago. I still have it because I never throw out anything that I might have a use for. It measures about 16"x22" with 1/4 inch squares overlaid with larger 10x10 squares. With 37 pages attached to the pad. Perfect for dungeon mapping. Maybe a little large to bring to the table. But certainly awesome. Now to fill it up old school style.