For safety reasons, I want to store my medicines that require a cool environment in a place other than the family refrigerator.

The product I had in mind was a mini fridge with an internal capacity of no more than 1 litre. It should have a lock to keep little fingers out. It should be dark inside (i.E. No window). It should plug into a normal household power outlet. Powering it from a computer's usb port would be a cool touch.

Does anyone know of such a product and place that I could order one?

Thank you