The Whole Foods location in South Lake Union, just blocks from Amazon’s headquarters in Seattle. (GeekWire photo / Taylor Soper)

Amazon is expanding its new Whole Foods grocery delivery offering, adding San Francisco and Atlanta to the service.

Amazon first announced the service last month and kicked it off in four markets: Austin, Cincinnati, Dallas, and Virginia Beach. Amazon plans to continue expanding the service throughout the year.

RELATED: We tested Amazon’s new Whole Foods delivery service in Austin, the upscale grocer’s hometown

Customers can get Whole Foods items delivered through Amazon Prime Now in two hours for free, or within one hour for $7.99, for orders of $35 or more. The service is available daily from 8 a.m. to 10 p.m.

The delivery service represents the latest integration following Amazon’s $13.7 billion acquisition of Austin-based Whole Foods last year. It’s a shot across the bow to other grocery delivery services — namely Instacart, which also offers two-hour delivery from Whole Foods and several other grocers.

Another recent integration came last month when the company extended its Amazon Prime Rewards Visa Signature Card, which is available only to Prime members and gives 5 percent back on Amazon purchases, to Whole Foods products.

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