LG Electronics has 27″ LG Ultragear UHD 4K (3840 x 2160) Nano IPS 1ms 144Hz HDR600 NVIDIA G-Sync Compatible Gaming Monitor (27GP95R-B) on sale for $549.99 – 30% off w/ promo code FLASH30 = $384.99. Shipping is free.

Specs:

• Screen size: 27″
• Resolution: 3840×2160
• Panel type: IPS
• Refresh rate: 144Hz
• VESA DSC Technology (O.C 160Hz)
• Response time: 1ms (GtG at Faster)
• FreeSync Premium Pro
• NVIDIA G-Sync compatible
• Ports:
  • 2x USB 3.1 (Gen 1 Type-A)
  • 1x USB 3.1 (Gen 1 Type-B)
  • 1x 3.5 mm Audio Output
  • 2x HDMI 2.1
  • 1x DisplayPort 1.4