Exclusively for Prime members, Amazon offers the Dell 28" 4K 2160p LED-Backlit LCD Ultra HD Monitor, model no. S2817QR, for $299.99 with free shipping. (Office Depot and OfficeMax charges the same.) That's tied with our expired mention from three days ago as the lowest total price we've seen for any Dell 28" 4K monitor. (It's a low for this model by $80.) It features a 3840x2160 (4K, 2160p) native resolution, 2ms response time, dual 9-watt integrated speakers, USB 3.0, DisplayPort, and two HDMI inputs.