I'm looking for an adjustable desk monitor arm for a 43" 22.3 lb Sony 43X800E.
Ergotron LX HD Sit-Stand Desk Arm:
https://www.ergotron.com/en-us/products/product-details/45-384#/
It supports up to 46" 30 lb monitor. Newegg has it for $242. Huge adjustable range.
Ergotron HX Desk Monitor Arm...