There really is no choice, you basically have to buy a smart TV.
However, even the Roku Smart TVs can be configured as plain old TVs. If you go through the initial setup wizard and just don’t give it a network…you’ll get a regular TV out of it.
I know that there are certain models out there that supposedly reach into your neighbor’s wifi and stuff, and who knows, but that seems a little extreme…at least most TVs nowadays can be rendered non-networked and then you can use them the other way.