If you watched the auction house long enough then you might know that one trick would be to buy low, either from vendors or right off the Auction House, and sell high. This is one of the ways to avoid forever grinding away for herbs or ores or skins or killing monsters hoping something drops. There are a number of vendors all over the world of Warcraft that sell items in limited quantity, as mentioned above, or there’s only one vendor that sells it, or there’s only one vendor for the item AND the item is limited (such as the throat piercer knives, from a vendor in Tranquillen.)
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