Update 9/12 - This is available again, if you missed it last time. It’s listed with a 1-2 month backorder, but in my experience, Amazon tends to underpromise on those.
Sometimes, I’m still amazed that you can get a 55" TV for $400, let alone one with 4K resolution, HDR10 support, built-in Roku software, and the ability to use your phone as a remote. This model is 1-4 weeks backordered, but you’ll still have it for all or most of football season.