Where to get parts, like volume control knob of Gen 2?

Whatever it takes to spend money on your kid in a way that keeps them learning valuable life skills so when they reach adulthood and have to pay their own bills they aren't asking you for money is the correct answer. Of course if your kid isn't that interested in it maybe just keeping your eye on the local junk yard for when your wreck with the right knob comes in is the correct answer?

 

Old thread I know but I don't think you can replace the radio control knob. I went to the local Prius mechanic who has a slew of parts Prius' on his lot and when he tried to get a kniob for me it broke off.