Now that I've started using HCG, I've realized that a mini fridge would be an excellent investment so I can store it privately. I would like one that would be about the side of a water bottle. I remember someone on the forum saying they have one that would fit like a can of soda. Where do you buy these? What are they called? I searched ebay and amazon and all I could find was ones that plug into usb. I need one one that plugs into the wall.