BuyDig has 27″ LG 27GN950-B Ultragear 4K UHD Nano IPS 1ms 144Hz G-Sync Gaming Monitor for $429.99 after applying promo code VPH in cart. Shipping is free.

Specs (source):

• Resolution: 3840 x 2160
• Refresh Rate: 144Hz
• Response Time (GTG): 1ms (GtG at Faster)
• Brightness: 400nits (typ)
• Panel Type: IPS
• Viewing Angle: 178 degrees (R/L), 178 degrees (U/D)
• NVIDIA G-SYNC Compatible
• AMD FreeSync Premium Pro
• Inputs:
  • 2x HDMI
  • 1x DisplayPort
  • Headphone
  • 1x USB 3.0 Up-Stream
  • 2x USB 3.0 Type-A Down-Stream