Deliveries to Resorts - Costco?

[TXAKDisneyFan]

I know you can order from places like Garden Grocer and Amazon and have them deliver to the WDW resorts (bell services accepts deliveries, right?) Has anyone ever ordered from Costco? We have 4 kids (3 in diapers), and are staying 17 nights - waaaay too many diapers to bring with us! Costco diapers are much cheaper than name brand, and we actually prefer them. (We do not have a car.)