[Mumbai] Trusted Used 2 wheeler dealers?

I live in Borivali side. I am looking to buy a used 2 wheeler as my running is low and new ones come usually upwards of 1L.

Hence, I am looking for a used one. I did go to olx and facebook marketplace but either most ads are from dealers or some asks are ridiculous and I don't know the ideal price of say a 20K kms run 4 year old scooter. I don't know how to assess that.

Can people from Mumbai suggest me reliable and trusted 2 wheeler dealers in and around Borivali side? I would prefer if you had personal experience or at least someone you know had.