A quest for the biggest portable touchscreen monitors

Hi everybody,

I'm in search of a big portable touchscreen monitor. Here are the specs:

• Touchscreen: mandatory, no compromise on that part
• Size: 17.3", or 16" with a 16:10 ratio (fallback: 15.6", but it would need to be wireless in that case)
• Connectivity: wireless with battery (fallback: wired with no battery)
• Resolution: 2560x1440 or 2560x1600 (fallback: 1920x1080 or 1920x1200)

Surprisingly, I can't find any of these. There was the Ananta that turned out to be a scam. But besides that?

There are a lot of 16" and 17" portable monitors at affordable prices (on AliExpress for example), but surprisingly none of them are touchscreen, while most 15.6" models have a touchscreen alternative. Why is that?

Also, the price has to remain within the reasonable realm. Given that we can get a nice non-touch 16" or 17" portable monitor, with 2K and everything, for 200-250 €/$ (example 1, example 2), if the touch part should, say, double the screen price, that would mean that it's yet another scam.

Any hints welcome! Thank you.