I believe this is the cheapest one which meets those specs. It's 21:9 (3440x1440):
http://www.amazon.com/Dell-UltraSharp-34-Inch-LED-Lit-Monitor/dp/B00PXYRMPE
If you don't want ultrawide, then Samsung makes the best curved monitors, though here's a list of all that exists on the market:
16:9 (1920x1080), curved, integrated (stereo) speakers:
-IPS- HP Pavilion 27c
-VA- Dell SE2716H
-VA- Samsung S27D590C
-VA- HP EliteDisplay S270c
-VA- Samsung S32E590C
IPS: In Plane Switching, near perfect viewing angles (depends on model, some are worse than others), great color accuracy, high defect ratio, low contrast.
VA: Vertical Allignment, decent viewing angles (depends on model), great color accuracy, low defect ratio, high contrast.
Those are key differences, ignore all else.
All the best!