I have this dual monitor one at work and havent had any issues: (56€) https://euroelectronics.eu/products/2-fold-monitor-holder-with-gas-spring-desk-bracket-monitor-arm-monitor-stand-vesa-75x75-100x100-17-32-for-2-monitors
The build quality on mine is quite nice, with everything important made out of steel or aluminum and even some cable guides for a neat setup. Mine is a dual mount, but the company also has similar working single monitor mounts like these one:
47€ https://euroelectronics.eu/products/monitor-holder-13-27-8kg-black-maclean-mc-860
The second one seems to be all plastic but that doesnt necessarily make it bad. They all support 6kg or more.
Everything kind of depends on how you use it tho. These things usually dont use any bearings, so if you move them constantly (like multiple times daily), they will eventually wear out. Another thing to consider is the depth of your table and the distance you want your monitor to be from your face. The range of movement is pretty decent on mine, but if you have a super deep table (like 1m) and attach the mount on the back, then it might still be too far back for you.