https://www.techradar.com/news/best-40-inch-tv

Tracking down the best 40-inch TV can be a tough job. While it's a perfect sweet spot  size for those that want to be able to, well, see their television (any smaller gets a bit puny), it's simply not a focus point for TV manufacturers. With great screens at large sizes easy to mass produce at affordable prices now, it's become their bread and butter.

That can make for a frustrating buying experience if you're on the market for something smaller than 43-inches.  While they're out there if you dig far enough through your local A/V emporium's wares, manufacturers like LG and Sony usually only offer a couple of models at that size each year.