Amazon Gives Grocery Business a Tryout launched its grocery delivery business, AmazonFresh, in San Francisco Wednesday as the world's largest Internet retailer expands into the giant consumer packaged goods sector.

AmazonFresh offers more than 500,000 items for same-day or early morning delivery, including fresh groceries and food from specialty shops in the city to toys, electronics and household goods.

Delivery is free on orders over $35. Orders can be placed by 10 a.m. PT for delivery the same day and by 10 p.m. PT for delivery by the next morning, in time for breakfast, Amazon said.

AmazonFresh started as a test in Amazon's hometown of Seattle several years ago. The service launched in Los Angeles earlier this year and now San Francisco. If those cities perform well, the company may expand to many other cities and even outside the U.S. next year.

The move steps up pressure on grocery store operators such as Safeway, Kroger and Whole Foods Market, as well as Wal-Mart Stores and Target, which also sell a lot of food and consumer packaged goods along with general merchandise.

Consumer packaged goods, including perishable food, is a $222-billion- a-year potential opportunity for Amazon in the U.S., according to a recent estimate from Carlos Kirjner, an analyst at Bernstein Research.

However, it is difficult and expensive to deliver fresh food quickly to a wide geographic area and several start-ups.

And Amazon is dropping its usual low-price strategy for the grocery expansion, a move that could limit its expansion potential.

Amazon said Wednesday that AmazonFresh will be offered as a free 30-day trial in select parts of San Francisco.

After that, customers have to sign up for Prime Fresh, which costs $299 a year. For that, shoppers will get AmazonFresh grocery deliveries and the benefits of Amazon's Prime subscription, which include free two-day shipping on most of the other products sold on

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