Recently bought a retina 32” screen (Japannext 6k 32”) for around $800. Pretty sure you can get a decent kb and mouse for under $100. But a “magic trackpad” alone is way more than that.

Looks like a cool monitor (900 euros here). I am happy to see that there are more and more of products in this category popping up. I wish they would chose better names though (Kuyon is pushing it, but Japannext is very Aliexpress coded).