Have you really considered the viability of drop shipping products such as pasta and related products. You're talking about quite basic products here, not gourmet, and every supermarket will have this type of stock on their shelves and be buying in massive volume, giving them rock bottom prices.
My concern would be that no drop shipper would be able to provide you with a price that would provide any margin against supermarket prices firstly, and then that would only be compounded by shipping charges to the purchaser. I would suggest maybe staying in the same genre, but looking at more gourmet lines. Products that every supermarket doesn't have, so they aren't simple and cheap for people to find.
Anyway, just a thought :)