Dell have a 30% off sale on select monitors. Ends on Thursday. This one seems a stand out at $559.30 Delivered
Dell 28 Ultra HD 4K Monitor: S2817Q
30% off deal details and other items…
https://www.dell.com/en-au/shop/deals/ar/8245?ref=1400_offer…
I see you can get it for about $540 delivered off eBay (PLUG5 code) but Dell.com purchase comes with 3 year warranty.
IMO the P3418HW for $750 is a really good price.