I stumbled across a handful of these at my local craiglist:
Z-Wave BeNext Dimmer Socket http://www.vesternet.com/z-wave-benext-dimmer-socket or at producer https://www.benext.eu/en/products/plug-in-dimmer/
I couldn't find it on the supported hardware list and wonder if its known under a different name? Not a single reference on the entire indigo-board seems almost unlikely!
Will it work unsupported?