You might be blinded by your own country’s prices there mate, but even considering that, not many people are calling any $400 TV “high end”.
By all means have a look on UK amazon (or any UK store) for a new 55in screen for under £200 though…
A high end tv is over a grand, whether that’s from US Walmart or UK John Lewis. What “high end” TV can you show me advertised at $400? Lets keep it simple and just say any OLED 55in screen. Not particularly high end necessarily but I bet you can’t find a $400 one, in fact I doubt you’ll find one for 3figures.
I just checked Walmart US and not sure how you arrived at 240. The absolute cheapest 55in TV is 250. Where you get 240 average i have no idea, maybe a few TVs elsewhere but they’re at the absolute bottom rung for quality and we’re talking about affordable TVs , not budget ones.