The visually unobtrusive Blink Mini 2 security camera can fit in the palm of your hand, and Amazon has sliced its price tag in half for Prime Day: You can pick one up for just $20. This fully weatherized camera (IP65) can be deployed anywhere within range of an AC outlet, indoors or out (the SKU with a weatherized power supply is 40% off, $30, or you can buy the adapter separately for $10). This latest model has on-device computer vision to support person detection as well as general motion detection, and an LED spotlight to illuminate an outdoor path and to provide color night vision. Get thi…