My dad and I got ours from a Monument cutting place near us. The tombstones that have stuff cut into the front starts with a square slab and when they start cutting out for the design they usually have to leave a lip around the edge for errosion. It is already rounded and smooth edged where they hollow it out. They also have a hole drilled in the corner where they start which makes it easier to pick up and move around. We each got a huge piece of black granite. Free. Consider this as an option.