Ralphs’ Delivery Savings Pass provides customers with unlimited, same-day grocery deliveries for $79 a year. Shoppers are seen here waiting in long lines at a Ralphs in Northridge.

Ralphs announced Tuesday that it is launching home delivery at select locations in Southern California, including San Diego, through a partnership with Instacart, an on-demand retail delivery service.

The bigger news, however, is what they’re delivering: In addition to fancy organic foodstuffs from Whole Foods, Instacart is now offering grocery items from CostCo. and Ralphs Markets to some areas.