You should "let your fingers to the walking" through the yellow pages. I saw them at either (or both) Bristol's or Wayside outside of Rochester last year. Any big garden store that delivers mulch and garden stone might have them. Those cement tree slices have been around since at least the late 70's. In your area, Chuck Hafner's perhaps?
~Bunnycat

I know GardenFactory has them.

Check out...

http://www.gardenfactoryofny.com/patiostone.htm

It's a bit of a drive for you, since it's on the west side of Rochester, but if you waiting until the plants are out, it'd probably be worth it. It's gotta be the largest nursery in WNY!

Tara

Thanks for the help. I was able to track some down at the Hardware store in B'ville in case anyone else was looking for any.