Now that I have several cards, I am interested in learning how to maximize the rewards on each. I was bummed to find out that AmEx does not honor 3% back on groceries if purchased at WalMart, so I thought I would shop at Kroger from now on to get the 3%. Then today I wondered if I could use the 5% cash back Discover Deal on WalMart.com to buy WalMart gift cards. Has anyone tried this? Does anyone have any tips for me about maximizing rewards for my cards (AmEx BCE, Discover IT, and QS1). Any tips and hints are appreciated. Thanks in advance.