We used Garden Grocer for our most recent Walt Disney World vacation. Prices are a little higher than a normal grocery store. However, the convenience of not having to find transportation to and from a grocery store, the saved time by not going outside of the resort or parks, the ease of having it delivered, and the confirmation of delivery was beyond what I expected!
I love using Garden Grocer. I order all of our toiletry items so we don't have to pack them when we fly to Orlando. It saves room in our suitcases and we don't have to worry about items leaking during our flight. We also order snacks for the kids to have on hand for when we are touring and bottled water so we don't have to spend time buying it in the parks. The less I have to pack from home the better! And their prices are very reasonable.
Deliver items on time!