Power Adapter replacement

I have Zmodo POE NVR model ZP-NK16-S. The power supply went bad does anyone know where can I
buy a replacement?
It is a SUN-1900600 input 100_240-50/60Hz, Max 3A. output 19V 6A

How long ago and where did you purchase the unit?

Purchased from store on e-bay not for sure when I think spring of 2014