I’m surprised no one has mentioned repurposed iPad screens[0]. I just received mine, and it’s fairly nice given the price. It uses a 4:3 aspect ratio, but that’s fine for secondary content when working on my laptop. It also works great for retro gaming as indicated in the link I shared. I only wish it were in the original iPad case and I could use an iPad stand. As it is, it’s housed in a photo frame with cutouts for the new buttons. I selected the USB C option for mine, which is how I connect it to my laptop. Very happy for $80.

[0] https://misterfpga.org/viewtopic.php?t=3373