Walmart (WMT) is rolling out its Delivery Unlimited grocery delivery service nationwide. The new membership program will launch in an additional 1,400 stores, starting this fall.

The retailer previously offered Delivery Unlimited in four markets – Houston, Miami, Salt Lake City, and Tampa – and now has plans to expand the program to all of its U.S. store locations. The rollout follows the pilot program, which Walmart said received a “positive response” from customers.

The rollout will encompass all 200 metro areas, where Walmart current offers grocery delivery. The company said it also has plans to expand the Delivery Unlimited option as its grocery delivery service expands to other markets and stores.

With this nationwide rollout, Walmart said it will offer Unlimited Delivery at more than 1,600 stores and more than 50 percent of the country by the year-end.

“Grocery Delivery takes convenience to a new level, and our customers love it,” Janey Whiteside, chief customer officer at Walmart, said. “With Delivery Unlimited, we’re providing incredible value for our customers and leveraging our unique assets to save them both time and money.”

To use Delivery Unlimited, customer can pay a yearly fee of $98 or $12.95 per month to received unlimited grocery delivery orders from Walmart. Shoppers that decide not to enroll in the membership program will still have the option to pay a per-delivery-charge.

Customers that want to try out the Unlimited Delivery program can do so for free with Walmart’s 15-day trial of the service. Customers can place their grocery order online at Walmart.com/grocery or by using the Walmart Grocery app.

According to Walmart, customers will also find the same prices on products that they will find in stores without an added premium or hidden cost.

“We’ve been investing in our online grocery business by quickly expanding our Grocery Pickup and Delivery services,” Tom Ward, senior vice president, digital operations at Walmart U.S., said. “Delivery Unlimited is the next step in that journey. By pairing our size and scale and these services we’re making Walmart the easiest place for to shop. Combine that with the value we can provide, our customers can’t lose.”

To ensure that its grocery delivery service meets the demands of customers, Walmart has employed more than 45,000 personal shoppers. The company also offers grocery pickup service at nearly 3,000 locations.

Shares of Walmart stock were up 0.19 percent as of 10:48 p.m. ET on Thursday.