Then, in June 2016, it teamed with Uber to offer delivery in Phoenix and then quietly expanded to Tampa in March.
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An estimated 52 million Americans shop for groceries online, according to the NPD Group.
Consumers who want to buy their food and beverages via the Internet aren't limited to Walmart, though. Whole Foods, Costco and Kroger have teamed with Instacart, as have regional chains, like Albertsons and Stop & Shop. Aldi joined the list last week.
With Amazon's $13.7 billion bid for Whole Foods, the question remains what will happen the Seattle-based Internet giant enters the grocery game at full throttle.
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The online grocery business is $675 billion a year, according to Morgan Stanley Research.
In April, Walmart began testing what would happen if its employees delivered online orders on their way home from work.