What you are looking for is a 12v power supply (takes 110v AC in - and outputs 12v DC...) can be wired to a female cigarette lighter if needed...
Have an extra PC power supply? its a good source... they typically need a light bulb (or some load) wired across their 5v output wires before they will output on the 12v side...
I have found small adapters that plug into 110v and give cig lighter receptacle... Like one of these:
https://jet.com/product/detail/152c8...a:2&code=PLA15
but won't handle as much current as other choices...
Or connect to a tractor battery... or the MH coach or chassis battery.