Personally I would send mine to tighed1. He has done many from countries from outside the U.S. He fixed mine about a year ago and it's great and my horn works now without a key in the ignition!
I think he sells already refurbished ones, but you will have to send him your old one.
However, if you don't want to send it, you purchase one now. Here is a link to one on Amazon in the U.K.