I have a Horntones FX-550 that I was going to use but never got around to it. This is a universal custom horn that allows you to customize the sounds of your vehicles horn function using any audio file.
I literally opened up the box, looked at everything, then put it in my basement for a few years. This retailed for $399.00 several years ago. The lowest I've seen this product sold was $250.00. I'm offering it for (edit) $100 NOW shipped.
Product link: www.horntones.com/products.html