BENTONVILLE, ARK. — Walmart, Inc. plans to expand its online grocery delivery program to 100 markets in the U.S. by the end of the year. The service is currently available in six U.S. metropolitan markets.

The program includes same-day delivery. Consumers will be charged a $9.95 fee, and orders must be no less than $30.

“We’re saving customers time by leveraging new technology and connecting all the parts of our business into a single seamless shopping experience: great stores, easy pick-up, fast delivery, and apps and websites that are simple to use,” said Greg Foran, president and chief executive officer of Walmart U.S. “We’re serving our customers in ways that no one else can. Using our size and scale, we’re bringing the best of Walmart to customers across the country.”

Walmart’s announcement comes a month after Amazon and Whole Foods Market announced the trial of a two-hour delivery service to consumers with an Amazon Prime membership that live in the cities of Austin, Texas; Cincinnati; Dallas; and Virginia Beach, Va. On March 13, the Kroger Co. said it was expanding its partnership with Instacart to offer same-day delivery from 55 of its stores in central Ohio.