Zynga Combo Cards now available at GameStop, Walgreens

FarmVille, Mafia Wars and other Zynga game gift cards have been available since February, but now Zynga combo cards have started to arrive at select retailers -- possibly a move on Zynga's part to stay competitive with the new Facebook Credits gift cards that arrived in Target in earlier this month.

Zynga combo cards can be purchased for $10 and $25 at Walgreens and GameStop in the US, and they can apparently be used for a variety of Zynga games, including Zynga Poker, even though the game is not featured on the cards. After cards are activated at the cash register, you can redeem them by entering the PIN number on the back into the according game.