Its interesting that you mention that you make "bowling ball size" spheres of agate because I just bought one, an onyx 10", recently. I was wondering if the price I paid was a good one because I thought it was. Its the green with brown,rust coloring type of onyx, kind of a common type. I paid $160 for it and lugged it home. Was that a good price? As a marble collector of many years, I have always wanted one of these huge spheres but I had always seen them at over $300, so I jumped at this one.
Thanks,
Phil