I pack a lot of them, but with each trip I take (to any place in general) I'm always afraid I won't pack enough of them. So if this happens at WDW what are my options? We are staying at a resort, so I can't go to walmart to get some, kwim.
Yes they carry diapers at all the resorts in the gift shops. Or take the bus to DTD get off at the second bus stop and walk across the street to the Hess station they carry diapers. Not a huge selection but they have them.
Here is a link to photo's taken inside the Hess gas station. If you scroll down you will see the diapers.