I just wanted to add, that the heat pump effectiveness is true but a big part of the loss on tiny fridges is the insulation. Many manufacturers cheap out on that front for mini-fridges. You run at a greater energy consumption to compensate for the lack of proper insulation.

Get a good, well insulated mini-frige (using a proper compressor/heat pump) and you’re all set. Buy once, cry once, and do your homework folks!