The price of this item has varied due to countless shop updates over the years. Vials of water hovered between 150 and 200 coins prior to the introduction of the Grand Exchange. When shops were updated to have unlimited stock, the price of vials of water plunged and then steadied at about 70 coins each. Then, due to the personalised shops update, the price of this item increased past 240 coins because of the limited number of items in each shop. Vials of water received a price cap of 103 coins on 13 October shortly after the update, along with eyes of newt, lowering it by over half the price. Vials of water were virtually out of stock on the Grand Exchange due to the sudden price change. In order to compensate for the shortage, the vials of water stock increased in Shilo Village from 200 to 1000 on 20 October. On 9 November 2009, vials and vials of water started to be sold in item packs in many stores, allowing players to buy large amounts at once. The ease of obtaining vials of water caused the price to crash again to around 11 coins. For several months, vials of water steadied between 30-50gp each. They now stay below 50gp most of the time.
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Players with the ability to access all the shops that supply vial of water packs can obtain 6,600 vials of water through visiting every shop, for a modest cost of 66k. This method requires very little effort. The individual vials sell for 65gp each on the Grand Exchange, resulting in a profit of 363,000gp per run.
For non-members, an old style hand pump just north of the west bank in Falador provides only a short running distance. Members may find that both the geyser in Neitiznot and the sink in the cellar of Lumbridge Castle are great places to refill vials with water due to close proximity to a bank and one-click banking chests. Higher level members may also use the water pool located in the Meilyr section of Prifddinas if one does not wish to purchase directly from Lady Meilyr.