If i'm not mistaken, this may have to do with environmental laws.Yes, and that's a strange thing. I wonder what could explain that. Local differencies in some specific appliances or what. Some bizarre environmental legislation locally maybe..
Iirc the BR2032 contains more toxic components , so the CR2032 is usually offered as a common replacement.
The BR2032 is for specific purposes and therefore, as stated by @14UG , relatively easy to find at a professional electronics supplier.