List is $60. But my understanding is, so far repairing the broken wire puts it back in service.
I am not ready to purchase one for stock,..yet.
I have not seen the corrosion first hand. But, I would think it would be visible if you made the effort to see the connections on the back of the switch.
My tractor won the lottery when I bought it, Fergie was immediately put on light duty, semi retirement. It has been kept indoors. And doesn't even go out to plow snow when the weather is bad anymore, (only because I don't want to be out there). So, I don't know if mine has any corrosion, but I will look this summer.