Guys, this is still on sale at Lowe's. Lowe's normally doesn't sell TVs, they just got this for Black Friday door busters, but there are still LOTS of these available, a few dozen in western Washington.
Check brickseek for inventory, and then call. You can buy over the phone. I bought two.
This beats out the Costco BF deal: https://slickdeals.net/f/10923971-samsung-40-inch-4k-uhd-hdtv-40mu6290-275-at-costco-after-25-coupon-325-for-the-43mu6290?v=1&src=SiteSearch
And Microcenter also still has it on sale for 299: https://slickdeals.net/f/10977619-samsung-mu6290-40-class-39-9-diag-4k-ultra-hd-led-smart-tv-299-99?v=1&src=SiteSearch
For those who don't know, you don't use this as an actual TV, you use it as a MONITOR. This is one of THE BEST 40 in displays as a monitor. You cannot find an actual "monitor" at this size that beats this, and certainly not for $300.
Minimal input lag, 4K @ 60 Hz 4:4:4 over HDMI with HDR support. Semi-gloss.
No freesync gsync, but just fine for casual gaming.
Monitor review: https://www.rtings.com/tv/reviews/samsung/mu6300