To offer a non-walmart option, I've been using the Rtings table tool to find consumer TVs are potentially more respectful of privacy. Although I get the impression a number of sets aren't captured here (maybe walmart has some listed that Rtings doesn't), they are fairly thorough.
You could say "I'm not installing software updates" and be safe from ads as long as you don't need any bugfixes, but then you're also missing out on security updates. If you keep it off the internet maybe you're ok, but your TV might start connecting to a neighbor's wifi to give you more advertising.
https://www.rtings.com/tv/tools/table/53948