Amazon has announced the first major integration between its e-commerce operations and its acquisition of Whole Foods. The company is adding groceries from the chain to its Prime Now high-speed delivery service in four markets — Dallas, Virginia Beach, Cincinnati, and Whole Foods’ hometown of Austin. Amazon Prime members will be able to order groceries for delivery within one or two hours; two-hour delivery is free, while one-hour delivery costs $7.99 on orders above $35.