Just wanted to let you know that the order of ceramic tiles that I mentioned arrived and I am thrilled! It all worked out just fine and the tiles are beautiful! Love the colors! I've tried pricing them and I feel like I got a pretty good price. They're not frost proof, but I've already resolved to the fact that I'll have to bring the sphere in for the winter anyway so I'm ok with that.
Here is a link that might be useful: American Olean Brights