pluto,
It's not too late to sign up and start filling that locker on this trip. John will deliver it whenever you need it. You can bring things along or buy them while you are in WDW and leave them in the locker for your next trip (don't forget to keep a list--there's even a place on the Owner's Locker website to record the contents of your locker). You will be amazed at how much this service adds to the convenience of your vacation. And, as others have said, the personalized service of the OL guys is top shelf.