Find vendor
 

Does anyone know if there's an addon out there that'll assist in finding a vendor that sells a specific item?

In my case, When I'm looking to restock on ammo, I want something that'll assist me in locating the closest ammo vendor.

That's already in the default UI - Track Ammunition.

Not exactly. That'll only show you the current area around you.

For some zones that might have multiple towns... :) Not to mention, I've noticed there are a few vendors that sell arrows in Orgrimmar. Not all of them sell the higher end ones. :)