Before you get a junkyard horn pad,
 

Call the dealer, the one for my car was $16 !!!!!!
And it's a new factory part.

I assume you mean the contact?

Mine was $10! :D

BTW are these a common problem? My pro was sitting in a garage for about a year and the horn started going off by itself....

**edit**

Whoops, didn't see the other post :)

I am talking about the contact plate that is installed in the steering wheel, that you press and the horn goes off. Chances are very good that the ones in wrecks are in bad shape too, and you will pay at least $5 for one. As you found out, they are cheeeep new!!!!!