I don’t know where you’re shipping from, but this may not be cheap. You have one week, and that could mean the cheaper Ground shipping will be too slow, so you have to go with the more expensive Air (if UPS or FedEx).
Also this is the time of year where the carriers can’t keep up. I ordered something through
Amazon Prime which was supposed to be delivered to my house on Friday. On Friday morning, the UPS tracking said Out For Delivery. Never came. On Saturday morning I got an email that the package will arrive by the end of the day on Tuesday.
If you use UPS or FedEx, the package will go to the Business Office in the YC/BC Convention Center. The outside vendor which runs the office will charge a handling fee. I believe you can call over and have your boxes brought to your room, but only during certain hours. If later, ask at front desk.
If you use USPS, the boxes go to a central delivery office at Disney World before going to your hotel, so you need to leave extra time for that. Boxes will be delivered to hotel front desk. Disney can charge a handling fee.