Multiple online sites provide grocery delivery, some of them offering free delivery of the first order only. After the first order the customer is charged varying prices for home delivery.
Amazon.com is the largest grocery delivery site with thousands of items offered either shipped directly from Amazon.com or from its participating suppliers. Products range from basic pantry items to gourmet, international, gluten-free, wine and bulk quantity items. Customers can join a "subscribe and save" program that offers a 15 percent discount on each order. Regular orders over $35 are shipped for free as of 2015.
US Grocer offers free delivery on orders of more than $40. Items offered include groceries, household supplies, beverages and pharmacy. Items can be ordered as a single unit or in bulk.
Mashable provides a list of more than 50 sites to buy groceries online. It is a helpful site for both regional and national resources for buying groceries online.