Walmart Inc.-owned Sam's Club said Oct. 18 that the membership-based wholesale store chain will expand its same-day grocery delivery service with Instacart to over 100 outlets by October-end.

Sam's Club in February began a pilot of the service with the San Francisco-based same-day grocery delivery provider in the cities of Austin and Dallas-Fort Worth in Texas and St. Louis, Mo., as well as recently in San Diego and Los Angeles.

The expansion will cover nearly 1,000 new ZIP codes and 90 new markets across the U.S., including New Jersey, Indianapolis and Houston, and cover more than half of all Sam's Club outlets.

Instacart customers also will gain access to Sam's Club stores without a membership, enabling them to purchase exclusive Sam's Club items at lower, member-only pricing.

The retail giant launched Sept. 13 Instacart services in Canada, where Walmart peer Costco Wholesale Corp. already offers Instacart deliveries.

Instacart has forged partnerships with a number of supermarket chains in the U.S., including Sprouts Farmers Market Inc., Albertsons Cos. Inc. and The Kroger Co.