Originally sold at Profiles in History. Found the owner and they were willing to sell. I don't have it in hand yet but I'm going crazy. I think heroin would be a cheaper addiction at this point.
I've only seen two of these before. Both at the Profiles in History auction. A 1/1 scale (mine), a enlarged detailed model. But there is a new Profiles in History auction for the Arnold bust used for that CPU removal scene and it has the port but no caps or plugs.
T-1000 computer brain from Terminator 2 - Prop Archives : original movie props, screen used wardrobe
Arnold Schwarzenegger
$8K starting bid on that, yowzers!