: Plasmas were known "energy hogs". As energy standards like Energy Star became stricter in the US and EU, they could no longer compete with the efficiency of LED TVs.
The short answer is Major manufacturers like Panasonic , Samsung , and LG officially ceased production between 2014 and 2015. While you might occasionally see "new" listings on wholesale sites, these are almost exclusively mislabeled LED/LCDs or extremely rare unused old stock (NOS) discovered in liquidations.
: Because they used two thick sheets of glass, plasmas were significantly heavier and generated much more heat than their LED counterparts.
If you are determined to find one, focus on high-end models from the 2012–2014 era, which represent the pinnacle of the technology.
Despite being revered for their picture quality, several practical and economic factors led to the demise of plasma technology: