I recommend Garden Grocer all the time to friends and family, and no one has ever had a bad experience with them. Prices aren't outrageous, and I've always gotten everything I needed! Our groceries are always waiting for us at bell services when we arrive, including cold stuff that is kept refrigerated for us! Check them out!
I should say, though, that I normally shipped diapers and wipes to our resort, as well as formula (when my daughters were still on it!) I hated taking the chance of not getting my specific brand of formula-- so I can't share experiences with those sorts of thing. Considering my experience, though, I'd guess you'd have no trouble!