You can get a great two or three year old 4K TV starting for less than $300. They may not last you decades like the box TV ...

The QM6K is a powerful entry-level budget TV from TCL with 144Hz native refresh rate, HDR formats like HDR ULTRA with Dolby Vision IQ, HDR10+, HDR10, & HLG, Dolby Atmos Audio, an anti-glare screen ...