I don't know but they are GORGEOUS!!
Im assuming you mean the cookie itself, as the rest looks hand done. It looks like a typical bell cutter, which I would imagine could be found at most craft/hobby stores. And most online stores should have them too. I think they're usually out around Christmas time, so now is the perfect time to get one! They are beautiful!
try copper gifts, they have great cutters
Tons of bell cutters out there (froogle. com search bell cookie cutter). Here's a few that look similar to the shape: