Salvage yard is where I’d look as they rarely fail. Mind sharing any backstory ? Good luck with your search.
Junkyard Prius that was put there from rear or side collision. Agree with others - just replace the entire assembly.
What could have happened to the stator maybe the drive axle got chewed up? Replace the trans is easier. You wont be able to buy a stator anywhere except maybe the dealer. Cheaper to buy a used trans.