Woodcraft put their 9″ x 12″ x 2″ granite surface plate on special for $20. A granite plate can be used for many applications requiring a true flat surface, such as sharpening and sanding.
To get free shipping, you need to pad the order a little with other items to bring the total over $25. These surface plates weigh about 30-35 pounds, which is why the free shipping is such a big deal.
9x12x2 Granite Surface Plate via Woodcraft