I have used Garden Grocer multiple times on my travels to WDW. The prices are comparable to what you would pay for at Publix, the service fee small, and the delivery and follow up very professional. If you have saved up to have a great vacation, then I highly suggest using this service so that you don't have to waste a minute of vacation in the grocery store. I do enough grocery shopping at home, I don't enjoy doing it on my brief vacation.
This was a great service and it was wonderful having my groceries waiting for me when I arrived at my hotel. I also liked that my conference roommates could log on after I placed an order and add to the order with their own credit card, and they did not have to meet the same minimum.
Service was easy to use and delivery to our room was perfect!