Amazon had made its name by offering free and fast shipping, but it's usually for stuff like socks or last-minute holiday gifts. Now, the company is testing out doing the same thing, but for your groceries, CNBC reports.

Now that the company has acquired Whole Foods, Amazon is going to start delivering groceries straight from Whole Foods as part of its Prime Now delivery service. Right now, the test is only in Austin, Cincinnati, Dallas, and Virginia Beach, but Amazon plans to roll it out across the United States this year. You can head to the Prime Now site and enter your ZIP code to see if you're covered.

If you have an Amazon Prime membership, you can shop in their produce, bakery, dairy, meat, seafood, floral, and staples sections through the Prime Now app or at primenow.com. "We might not have every last item that could be available in your local store but we're going to have the vast majority of them," Stephanie Landry, vice president of Prime Now, Amazon Fresh, and Amazon Restaurants, toldUSA Today.

Two-hour delivery is free for orders over $35, but if you're super rushed, you can pay $7.99 to get your stuff delivered in just one hour. The service is available from 8 a.m. to 10 p.m., so sadly your late-night junk food cravings aren't covered. Amazon Prime Now pickers will actually go to Whole Foods stores to pick out your groceries, and then hand them off to drivers, so store hours probably have a lot to do with these restrictions.

The move is the latest by Amazon to put its stamp on its recent purchase of Whole Foods. Amazon has cut prices on bananas, yogurt and other items, and began selling Kindle e-readers in some of its 470 stores.

Since Amazon bought Whole Foods last year, rival grocers have been working to increase delivery, worried about what Amazon might do. Target, for example, bought grocery-delivery company Shipt. Others have partnered with Instacart.

The Associated Press contributed to this report.

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