Does anyone know if a single unit from Zoomhash includes the barrel power connector??? I want 20, but plan on using a RPI, so I dont see the point in spending the extra $$ on the controllers.
No, they do not, unfortunately.
I can make them up for you though, if the price is right.

I made all of mine from type H and M plugs I bought at Radio Shack.
Soldered the cords on. The gauge I used is too thick for the plastic screw on jacket to fit so I simply heat shrinked on a jacket instead, since all other connections are also heat shrinked to prevent corrosion and electrical shorts too, of course

Very easy for me to do as I have decades of experience in the electronics and electrical trades.
They'll work 100% perfectly of course!
I'm thinking of making a couple different designs. I'll save the particulars for 'paying' customers

Wolfey2014