There is no extra fee for delivery to SSR. We used Prime Pantry last month for delivery to the Poly. It worked out great because all we needed were drinks, snacks and some breakfast stuff (dry cereal/oatmeal). GG and other local delivery services will deliver fresh food and frozen food too. Prime Pantry does not.
Amazon delivered on schedule. The box was waiting in our room upon our arrival. I would definitely use them again.