Noticed these were very cheap.
Brateck LDT09-C012 Counterbalance LCD VESA Desk Mount for 13"-27" LCD monitors
The LDT09-C012 is constructed with solid steel, elegant die casting aluminum and integrated with innovative counterbalance technology.
It can efficiently frees up space on your desk and easily move your LCD monitor into the best ergonomic position. Highly adjustable arm moves up, down, forward and back with just a touch.
With weight capacity of 6kg/13.2lbs, this desk mount features 360° monitor rotation, -90°~ +90° tilt, 180°swivel and vertical distance height adjustments. The desk arm is designed with cable management to provide neat desk space. The monitor mount is ideal for offices, homes, public area, industrial settings, production line and many more.
Specification:
By Grade: Premium Series
Material: Aluminum, Steel, Plastic
Surface Finish: Powder coating
Color: Black
Product Size: 500X590X117mm
Installation: Clamp, Desk mount
Suggestd Screen Size: 13"-27"
Screen Qty: 1
Weight Capacity Range: 0-6Kg
Rated Load: 6KG
VESA: 100x100;75x75
Tilt: +90°~-90°
Swivel: +90°~-90°
Level Adjustment: /
Rotate: +180°~-180°
Arm Extend: 442mm
Height: /
Clamp Thickness: 10mm-85mm
Freely Height Adjustable : Yes
Cable Management: Yes
Anti-theft: No
Curved TV Available: Yes
Certification: /
Patent: /
Others: /
User Manual: Yes
Price in title please
Edit: This is standard price. Not even cheapest on ebay right now. Search "Gas monitor arm"
https://www.ebay.com.au/itm/Fully-Adjustable-Single-LCD-Moni… seems to be the cheapest currently. $37.90 before using 5% off… but this is still standard price
Further unsolicited advice on these - unless you're desk-edge-space-constrained, if 2 single arms cost about the same as 1 double arm, go for the 2 single arms. MUCH more flexibility in mounting, especially if you have screens >24'