Blizzard has introduced World of Warcraft Guardian Cubs, pets that can be bought from the Pet Store with real money, and sold in-game for gold.

Guardian Cubs are bind-on-equip items and cost US$10. They can then be sold in the Auction House and players can carry more than one.

The system is somewhat limited, as the Guardian Cub comes at a standard price and the in-game market will determine its in-game value.

“While our goal is to offer players alternative ways to add a Pet Store pet to their collection, we're OK with it if some players choose to use the Guardian Cub as a safe and secure way to try to acquire a little extra in-game gold without turning to third-party gold-selling services,” writes Blizzard.

“However, please keep in mind that there's never any guarantee that someone will purchase what you put up for sale in the auction house, or how much they'll pay for it. Also, it's important to note that we take a firm stance against buying gold from outside sources because in most cases, the gold these companies offer has been stolen from compromised accounts.

“While some players might be able to acquire some extra gold by putting the Guardian Cub in the auction house, that's preferable to players contributing to the gold-selling black market and account theft.”