Whole Foods is doubling down on the instant delivery trend.

The national food chain announced Monday that it is partnering with Instacart, a grocery delivery startup, to deliver items to shoppers' homes as quickly as within as one hour. The option will initially be available at select stores in Boston and Austin, Texas, this month, with plans to expand into all 15 cities nationwide that Instacart currently operates in at a later date.

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"Instacart makes it extremely easy for our customers to buy Whole Foods Market products from 15 cities and have them quickly delivered — whether buying fresh ingredients for dinner tonight or sending healthy foods to loved ones in another city,” said Walter Robb, co-CEO of Whole Foods, in a statement. “We are thrilled to add this additional convenience for our customers.”

Instacart was founded by a former Amazon supply chain engineer in 2012 and crowdsources deliveries using a fleet of personal shoppers in each city. The startup has raised more than $50 million in funding to date.

To take advantage of the option, customers can place their grocery order on Instacart's website or app and select to have it delivered within one hour, two hours or another time frame.

The same-day delivery space has heated up in recent months with startups like Instacart and Postmates competing against new efforts from bigger names like Amazon, eBay and Google. Google, in particular, is reportedly ready to invest $500 million to expand its same-day delivery service, Google Shopping Express, nationwide.

Whole Foods was also an early test partner for Google Shopping Express in San Francisco.

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