I found a monitor supporting KVM for only $132. It's an MSI, but not sure if the model is available outside of Korea: MSI MD272XPW[1]

The monitor with the specs I wanted was $201[2]

[1]: https://prod.danawa.com/info/?pcode=29877128

[2]: https://prod.danawa.com/info/?pcode=74545976

Most people are unaware that the should buy a monitor with USB and DP-Alt mode. The same people are also unaware that they should ensure the same for the laptop they are buying.

Lower prices are always nice. But such things can be found at reasonable prices. I think awareness is a larger problem.

I am happy enough with the built-in speakers. But I do agree that line level aux out on the back would be nice.