For its Pals Rewards members only, Petco via Facebook offers a 5 Rewards Dollars Credit for free via this Pals Rewards Push Facebook game. (Click "play" to begin the game, and enter your Petco Pals Rewards number when prompted. Credits will appear within 7 days.) That's tied with our March mention as the best such offer we've seen from Petco. (You normally have to make $100 in purchases to earn 5 Reward Dollars.) Limit one credit per Rewards account.