I rarely shop online for a lot of reasons but this one has my eyebrows raised. Now you can shop at Banana Republic, Old Navy, the Gap and Piperlime (all sister stores) at the same time, with one checkout. One checkout! Customers are charged one flat rate ($7). It's a brilliant move on Gap Inc.'s part--making it easy for people to shop multiple stores at the same time. I know a couple of people who will be thrilled about this news! Or maybe you already know and I'm the last to know?