I have a used in good condition a CTA Digital Heavy-Duty Arm Mount with Lock for 7-10" Tablets.
Everything works, it is just a little discolored on the middle arm.Aluminum alloy and metal frame for strength and durability
Spring calibration system to help manage weight shifting.
6 pivot points provide a wide variety of direction, height, angle and orientation options.
Key lock on the mount for safety and security (key not included).
Compatible with most 7 – 10 inch tablets, such as iPad Air 2, iPad mini and Google Nexus 9.
C-clamp setup for easy install and dismount.
Grommet setup for more versatile installation options and a cleaner look.
Cable routing system.