I bought a 32-inch dumb TV just a couple of weeks ago. It was only $77US, on clearance at Walmart from $129US. The brand is Element, which I'm unfamiliar with, but it works nicely and has absolutely no smart capabilities. So you can find dumb TVs on the low end these days if you look for them.
So, a small, 720p TV? In other words, a TV most people don't want? I fail to see how that's an alternative when I'm looking for a 60" 4K model, not to mention I have no idea what the quality of the device will be.
Ive heard great things about swedx, never had one myself however. Theyre also not IPS/HDR.
Also, its important to use the pixel policy 1, there are some dead pixels otherwise.