There's a Z-Coil dealer in Nashville--the ads are on during local news a lot. I have seen exactly one person wearing them in public (although they make hidden coil versions, too)

Heyguesswhatguesswhat? I acquired a gigantic pot (thanks to Freecycle) which I have already used to overdye some things purple, and shall be moving on to black soon. You're my dying inspiration. *nods*