Hello Mario,
great you ask that, I am pretty interested myself.
Atm, I did not have time to persue this subjct any futher.
>
> So is there some fencing device supported in 100/200$ price range?
One option would be networked PDU's [2] (here in Germany, they are
around 200 Euro), maybe you can get some used ones. I think there is a
list with supported devices though I cannot find it ATM.
If I get it correctly the idea would be to define the outlet as Power
Management, and switch it on via PMP. Configure the hosts to boot at
power restore. The host would be shutdown via SSH anyway; the PM device
only used for start up.