I have seen 55 inch S405 multiple time and recently had here
https://slickdeals.net/f/11023399-55-tcl-55s405-4k-uhd-hdr-roku-smart-led-hdtv-320-more-free-store-pickup?src=SiteSearch
This TV is great TV btw specially ROku interface BUT it's no where compared to samsung high end TV like KS8000.