Best Buy via eBay offers the Samsung 42.5" 4K HDR Flat LED Ultra HD Smart Television in Glossy Black, model no. UN43NU6900, for $277.99 with free shipping. (Fry's charges the same.) That's the lowest price we could find by $19, although we saw it for $26 less four days ago, since expired. This 2018 model features:

3840x2160 (4K) native resolution

support for HDR10, HDR10+, and HLG

Smart TV with Apps (including NetFlix, Hulu, Prime Video, more)

USB port & 2 HDMI inputs