I snagged the last one probably minutes after cskent ordered his.
I have four other VV box mods---two Big Brother Variable Version 1s and a Big Daddy Variable Version 2 from Ken, and a lovely hand-painted Big Splash VV VM (built-in volt meter) from Shan Burkholder.
While I've followed with interest the development of the ProVari, Darwin, and soon-to-come Eclipse (plus the newly designed VV tank mod PV whose name I forget that's slated for later this year), I haven't felt inclined to wait for or buy any of those. I do understand that variable voltage is only a step in the direction of variable power (watts), but I'm very happy with my less-expensive VVs. My next purchase is likely to be a Little Sister Vari-Cool from Ken.
Apart from building one myself, Madvapes little 3AA box is about as cheap as VV can get.