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Here we will describe some of the Price Sources referenced on the Custom PricesStrings page in more detail.
 

avgBuy (Avg Buy Price)
avgSell (Avg Sell Price)
maxBuy (Max Buy Price)
maxSell (Max Sell Price)
minBuy (Min Buy Price)
minSell (Min Sell Price)

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vendorSell is the value of a particular item when you sell it to a vendor. vendorBuy is the cost of a particular item you can purchase from a vendor. Note that vendorBuy is only populated for a particular item when you visit a vendor that can sell it.

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TSM AuctionDB has several sources that offer item values in reference to your specific realm

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and your region

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DBMinBuyout (AuctionDB - Minimum Buyout)
DBMarket (AuctionDB - Market Value)
DBHistorical (AuctionDB - Historical Price)

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