I had to go out of my way to find a dumb TV. But when I found it, it was a few hundred cheaper than smart TVs of the same size. I saved money and headache!
I'll have to double check the model later but it's an RCA 55" LED display. I don't remember exactly how much I paid at the time, it was a few years ago.
When my mother bought a new 55" TV a couple of years ago, she didn't even know it was a smart TV (Android 4.4-based) until I came to visit and pointed it out.
She just ignores and never uses any of the smart features.