People have had a lot of trouble getting Costco to ship to the resorts.
The Contemporary has a convention center. When I stayed at the Boardwalk, the package I shipped down was delivered to the convention center. I couldn't carry it to the room myself because it was too heavy, so I had to go to bell services and ask one of them to get a cart and go over to the convention center with me to retrieve the box. I would think you would have the same experience at the Contemporary.
The convention centers are run by an outside company, and there is a fee when you get your package. The fee for a "medium size" package is $5. I'm not sure what the weight guidelines are.
The stuff I ordered from Garden Grocer was delivered right to Bell Services.