Amazon offers the AOC Agon 35" 21:9 Curved LED-Backlit LCD Gaming Monitor with Nvidia G-Sync for $679.99 with free shipping. (Newegg Flash charges the same.) That's the lowest price we could find by $118.

It features a 2560x1080 native resolution, Nvidia G-Sync technology, two USB 3.0 ports (with one charging port), HDMI, DisplayPort, and height-adjustable stand.

Update: Note that this item is temporarily out of stock, but can still be ordered at this price for delivery when available.