The cost to replace a panel (if you can even find one) will be equal to or exceed the cost of a replacement monitor.  Most reputable repair shops won't even try since monitors are very often assembled with strong adhesives that are just about impossible to remove and replace.  
I have dropped my monitor which is S2722QC and its LCD has been broken. It has warranty but as I was the one broken it, I just want to know if it is possible to repair and how much will be the cost around? Computer detects the monitor even can use its speaker via HDMI, so I think the only  problem is the LCD.
S2722QC, broken LCD, possible to get it repaired?