Folks can do this today in Austin, Dallas-Fort Worth and St. Louis -- and not just Sam's Club members, but Instacart customers, too. Walmart plans to expand this delivery service to 'millions of additional households across the US throughout 2018, and beyond' -- assumedly, outside the United States. Instacart had previously partnered with Target in 2015 to give the superstore's customers same-day item delivery, so Walmart isn't the first to pull in the San Francisco-based startup to provide a service rivaling Amazon's speedy shipping.