Earlier this year, a company called Ikon took over the business centers at the convention resorts. They are now charging for delivery of items shipped to the convention resorts (Contemporary, Grand Floridian, Beach/Yacht, Boardwalk and Coronado). You can still ship to those resorts but there will be a delivery charge. Shipping to the other resorts is fine--no delivery charge.
I would suggest that you not use the USPS because they won't deliver directly to the resort the way UPS or the others will. Make sure you use the street address of the resort and note your arrival date. if you need the street address, you can find it here. The Disney resorts are under "D."
www.ownerslocker.com/locations
john