At some point I asked here on HN. I got sent to a Romanian online electronics retailer. Apparently there's a pretty nice selection of non-smart TVs in Romania.

Sceptre sell them, at least in the US: https://www.sceptre.com/

in the UK there is a manufacturer called Cello who make non-smart variants of their smart TVs. I got their 50" 4K dumb tv for around £250