SideTrak Swivel 

Price: $324.99 ; Available on Amazon

The double, portable laptop screen brand just released their Swivel version to enhance productivity. This monitor securely attaches to the back of your laptop with a semi-permanent metal plate so you can effortlessly work anywhere with two screens. It features vertical screen rotation, screen autorotation, adjustable brightness, a built-in kickstand, and a smaller footprint on the back of your laptop.