there are a few preproduction sets floating around, but they're not commony available yet.
The sand casting that have been done so far has a very high reject rate. He is working on a much more reliable shell mold method for volume production. The mandrel bent tubing that replaces the black plastic tubing still needs to be finalized as well.
They're supposed to be available sometime this summer. I'll see if I can get a better ETA.