WoW Gold
Note: Blizzard will definitely make the effort to track you if you post auctions with exhorbitent buyouts, such as a kobold candle for 5,000 gold. If you want to buy more than 500 gold, split up your auctions to attract less attention.
Also remember that this is not a full-proof scheme - Blizzard IS the matrix, so-to-speak, so they CAN track anything occurring in-game they want, no matter how hard you attempt to obfuscate your trail.