LG 27UD58-B 27" LED LCD Monitor 5MS UHD 4K 3840x2160 HDMI DP FreeSync IPS.
Decent price for a well rated 4K monitor.
Original ebay price is $580 and after discount brings it down to $464.
Also has VESA attachments.
Original post: Original 20% off at Dell/Futu eBay Deal Post
Has been as low as $400 (+ delivery) in the past:
https://www.ozbargain.com.au/node/281725