http://wow.allakhazam.com/db/item.html?witem=6348
Look for mobs in your level range, and in a safe area if you're on a PvP server and grind.
Or, just ask around in the levels where it can drop, seeing if anyone has looted it.
Don't say something like "Paying 50s for Enchant Weapon : Minor Beastslayer" because more than likely, a more experienced player will reply over local saying it's worth more than that, and if someone does have it, they will try and sell it to you for an increased price.
Just ask people to whisper you if they have it and tell them the price you're paying in private