

Honestly, your required specs are basically any monitor on the market at this point, you can rotate the display orientation of any monitor with settings baked into any OS you’re likely to be using
You probably won’t even need to spend $100 for a 60hz 1080p monitor
If you can’t find one with an adjustable stand that’s to your liking, just look for one that can use a VESA mount and get another stand for it, probably less than $50
You can probably get 3 monitors and stands for your budget and still have enough left over to grab lunch.
Unless you have some gaming, graphic design, etc. needs you haven’t disclosed, I don’t think it’s worth getting too hung up on this, even cheap monitors tend to last a pretty long time


Yeah, there’s plenty of VESA mounts that will allow you to rotate the monitor, move it up/down, side-to-side, and tilt it forwards and backwards as needed
As for ones that will automatically change the orientation that things are being displayed when you turn the monitor from portrait to landscape, if that’s what you’re looking for, that’s a tougher nut to crack, I’m sure they’re out there but they’re not common, or (last I checked) cheap. But changing the orientation is as simple as Ctrl+Alt+arrow key (I think some newer Intel display drivers have changed that, but I haven’t looked too far into that)