cRefillAmmo is a very small (5kb) Stand-Alone AddOn.
It's meant for hunters who are tired of spam-click-buying ammo.

When you go to a merchant and this merchant sells your currently equipped ammo, cRefillAmmo automaticly refills your ammobag with this ammo.

FAQ
Q: Can I disable the popup and make it completly automatic?
A: Yes!
Go to your WoW programm folder > Interface > AddOns > cRefillAmmo (the folder you extracted cRefillAmmo to) and open the file "cRefillAmmo.lua" with a text editor (I recommend Notepad++) and search for the configuration part on top of the file.
Then start WoW or (if WoW is already running) type in "/console reloadui" to reload your interface.

Q: Why does it take so long to refill my ammobag?
A: This is a WoW issue. If you buy many item very quick, it takes several seconds to get a response from the server.

Q: How do I change the ammo cRefillAmmo buys?
A: cRefillAmmo buy's the ammo you have currently equipt. Just equip another ammo and it will refill this instead.

I'm from germany, so please don't mind my mistakes :o