My local Walmart had the VIZIO D-Series 50" 4k UltraHD 120Hz Full Array LED Smart HDTV (D50U-D1) on clearance for $249 in store only YMMV
I went there looking for the 55" 1080p D-Series for $249.99 that is currently front page here, but found this instead. Store had three of them and another was bought while I was there. (downtown Flagstaff, AZ)
Figured it was worth trading the 5" extra inches of display size for 4K. They had lots of display TV’s on sale for 25% off, but didn’t want to risk it on a TV that has been running 24/7 for over a year.
Brickseek
Walmart Link for reference.