Rob Grant i really don't know about in the bay Area, but i do know in the Tri-Cities of washington there are a few stone guys that sell them affordably. I'm up in Spokane, they're quite popular here as well.
best of luck on the search... this might be where google becomes your best friend!
I love that this fire bowl incorporates water, too. This one is also a nice choice if you want something beautiful with or without fire. I also really like the concrete blocks placed around it for seating.