quickshipelectronics via eBay has 49″ LG UltraGear DQHD 5120×1440 240Hz 1ms AMD FreeSync Premium Pro Curved Gaming Monitor (‎Open Box, 49GR85DC-B.AUS) on sale for $610. Shipping is free.

Specs:

• 49″ 32:9 VA Panel
• DQHD 5120 x 1440 at 240 Hz
• FreeSync Premium Pro
• 1 ms (GtG) Response Time
• 2500:1 Contrast Ratio
• 450 nits Brightness
• 1000R Curve
• Hexagon RGB LED Lighting
• Ports:
  • 1x DisplayPort (1.4)
  • 2x HDMI (2.1)
  • 1x USB-B 3.0 / 3.1/3.2 Gen 1
  • 2x USB-A 3.0 / 3.1/3.2 Gen 1
  • 4-Pole Headphone Jack