I bought a pack of 2 horns at Autozone a couple of days ago for $19.95. I wasn't expecting a lot at that price, but was very surprised at the sound. They are every bit as loud as the originals on those old Buicks and Caddys from the 60's and 70's. They are louder and have a nicer tone than the cheapo air horns I replaced too. I forget the name of them, but they have red caps and also included a relay in the package. I'm going to get another set for the wife's Corolla.