Earlier quoted context omitted.
> A 4K for $100 would be like a 40 inch screen with a horrible PPI. My 4K monitor was $70 and is 15 inches so, not sure where you got that figure from. (You're right that $400 is better though, that would get me a touchscreen OLED. Unfortunately I don't have that much money yet~)
A 15 inch 4K for $70? I would love to see that, no matter the quality.
That account still sells 4K monitors starting from $100, I only have a sample size of one so I'm not sure whether their descriptions are accurate but they're pretty non-specific so chances are you'll get a brand-new product even if they say "Front/back surface scratches or other scratches issue".
My experience with UPERFECT in particular is that their monitors reproduce sRGB extremely well. I haven't checked the specs for "HDR" mode though, because Windows doesn't properly support HDR.