sparky8251:
Not sure where I'd find one for this type of outlet (it looks like this.)
I think you're thinking about this wrong.
If the device you want to control is plugged into a power source then you need to get a similar plug and socket to make up something that looks similar to a very short extension lead which has your switch/controller in the middle. What you put in the middle is up to you, and as long as it is something that can be connected to wires, it should be feasible to use.
The the plug and socket are a standard type used for plugging appliances into the mains then you could probably find a powerswitch tail or equivalent that is plug compatible which would take care of the dangerous mains voltage part for you.
Depending how much current your device needs, you could probably find a standard digital thermostat capable of controlling it, in which case all you need to do is make the wiring connections to it and turn it on.