Staples offers the Dell S2817Q 27.9" 4K 2160p LED-Backlit LCD Ultra HD Monitor for $299.99 with free shipping. That's tied with our mention from three weeks ago as the lowest price we've seen for any Dell 28"-class 4K monitor. (It's the best deal for this model now by $130.) It features a 3840x2160 (4K, 2160p) native resolution, dual 9-watt speakers, USB 3.0, DisplayPort, and two HDMI inputs. Deal ends July 29.