Don't they all essentially require internet access to be 'smart'? I have a LGTV (with WebOS, an app store, etc.) that I basically treat as 'dumb' by leaving it disconnected from our network.
I have a Samsung S90, and I was able to disconnect from my network after the initial setup. I also set it to default to the last HDMI input at startup, so I never see the TV OS.
I feel like this is subject to change, but a smart TV without an Internet connection seems to still be an option until they take it away.