If I get a Prime trial for E3 pre-orders, would I be able to change the billing information? I'm getting a new credit card and shipping address, but I won't have either until well after E3. I know don't charge until after the item has been shipped, but I want to make sure they charge it to the right card. I've never really used Amazon before, so I'm not at all familiar with how they operate. I usually stick with Best Buy, but if Amazon has better deals/different games, I wouldn't mind giving them a try.