BenQ Direct offers its BenQ XR3501 35" 144Hz 2560x1080 LED-Backlit UltraWide LCD Gaming Monitor for $899.99. Coupon code "XR300" drops it to $599. With free shipping, that's the lowest total price we could find by $187, outside the price below. It features a 2560x1080 native resolution, 21:9 aspect ratio, 144Hz refresh rate, 4ms response time, and HDMI and DisplayPort inputs.
A close price: Newegg charges $599.99 plus $2.99 for shipping.