Mini-bar is the ultimate tease of a small fridge full of several types beer & spirits. With a pretty little price too, if any consumed.
With so many people removing these items to refrigerate their own drinks, I'd bet some of those beers aren't very tasty later on.
The fridge setting is never really very cold either (never noticed an accessible settings knob, anyone?).
Don't know anything about plug-in coolers, sorry!
Jim