The Samsung Smart Monitor M7 S43BM70 is a 4k smart monitor, and it's the replacement for the Samsung 43M70A. Unlike most monitors, it has a built-in smart interf...
No idea why they're so cheap. Looks like an OK display if its the same one reviewed here. Only 60hz and no adaptive sync though, so its lacking some features that have become pretty standard in even cheaper gaming monitors at this point.
The 32 inch ones youre looking at may have Freesync/Gsync and higher refresh rates which improve gaming performance, hard to say without knowing which ones youre looking at exactly.