Amazon has the GE Z-Wave Smart Lighting Control On/Off Toggle switch (number 12727) currently for $26.22. For some reason it is not showing up on the main page listing all the rocker style switches and the add-on switch. Here it is listed along with some of the amazon warehouse deals on the same switches.
Deal was found over at Slickdeals.
I also found found an add-on switch which toggles as well, which is great for trying to match the style of other switches in the wall.
Not there.
Apparently they have sold out. I got a couple right before posting and verified after that they were still listed. Looks like even the amazon warehouse ones have gone and they had several of those too.