Where's Siep when ya need him, lol. He asked a 1000 and 1 questions on this very subject awhile back over on the CD forum. Don't remember him saying anything about the shipping deal though. I do know it's all electronic and I believe the balance info is kept under your account tab.
P.S. Just razzin' ya, Siep if you should read this . Nothing but love for ya, buddy
Edit: You should also think about joining the CDCC later this year if it's offered. They offer a helluva deal on GCs once a year for club members.