Where can I get Indium III oxide

Where can I get Indium III oxide? For many people this is a strange object, and here's the introduction:

Indium oxide (In2O3) is a new kind of transparent n-type semiconductor, functional materials with wide band gap width, the smaller the resistivity and high catalytic activity, in the field of photoelectric, catalyst, gas sensor has been widely applied. Dana and indium oxide particles size m level in addition to the above function, also has the nanometer material surface effect, quantum size effect, small size effect and macroscopic quantum tunneling effect, etc.