Gary, try this site for novelty horns. They have audio demos for most of them.
http://www.wolo-mfg.com/
These are also the people that offer the cheap AHOOGA horn (I think JC Whitney handles this one, red bell on it). I've got the same one, not what I had hoped for but about what I expected. You usually get what you pay for. Good luck let us know what you decide on.
Steve