The ID of the creature. See creature_template.entry.
Position of the item when the vendor window opens.
The item ID. See item_template.entry.
The maximum number of items carried by the vendor at any time.
0 = Infinite
Combined with maxcount, this field tells how often (in seconds) the vendor list is refreshed and the limited item copies are restocked. For limited item copies, every refresh, the quantity is increased by item_template.BuyCount .
The value here corresponds to the ID in ItemExtendedCost.dbc and that ID controls the item's non monetary price, be it honor points, arena points, different types of badges or any combination of the above.