Find one you like and just don't connect it to the network?
Most TV's won't freak out if they lack an internet connection and are still fully functional (outside of services that require internet), and many can be updated via firmware on USB thumbdrive over sneakernet.
This is also more futurepoof - I have a relatively ancient (in TV timelines) Vizio that is so old that none of the apps were working with modern services (and even when they worked the were slow/laggy), so I just unplugged ethernet and drove it from other HDMI sources.