I've never bought direct from Blizzard before. If you buy a game, do you get e-mailed a CD key that you can use later on, or are you forced to use it now. I'm wondering because one trick I've used before when boosting accounts was activate the basic wow, run your 30 days, then activate the 10 day trial and activate that expansion after to get 10 extra days time. Works especially well for accounts you are going to toss after granting levels back