NCIX offers the LG 27" 4K Ultra HD IPS LED-Backlit LCD FreeSync Gaming Monitor, model no. 27UD58-B, for $307.99 with free shipping. That's the lowest total price we could find by $30. It features a 3840x2160 (4K 2160p) native resolution, LED backlight, 1,000:1 contrast ratio, 5ms response time, and DisplayPort and HDMI.
Of note, new customers can get a $20 NCIX Gift Card for free with this purchase via coupon code "NEWNCIXCUST20".