Replace side mirror on C300
 

Hello all,
I was reversing my car ( 2016 C300 , recently got a pre owned ) and hit the side mirror (right) to the pole of the covered parking. The outer cover is fine, but the mirror glass is shattered. The indicator light and blind spot light are functional.
The dealer quoted 1445$ for repair.

I am looking at just replacing the mirror glass. The motor is functional, but the frame is damaged only a bit. I am thinking i can live with it, but will try replacing the glass first through a local mechanic.

My question is, have they discontinued the right side frame? i cannot find it anywhere,

Also, what is the best site to buy OEM parts?i see a lot of them online.

Thanks for help!