Google has been slowly expanding its Shopping Express service over the past year in a bid to compete with Amazon on same-day deliveries. For now it’s still only available in and around San Francisco, Los Angeles, and New York, but according to a new report from Re/code the service is about to expand nationwide as Google fights to control the future of product search. One anonymous source with knowledge of the company’s plans claims the search giant has already earmarked as much as $500 million to bring Google Shopping Express from a few cities to the entire country. In a statement to Re/code, Google essentially confirmed the news without revealing how much it plans to spend on the service. Google could potentially earn back that $500 million pretty quickly, especially with the grocery business currently valued at $600 billion. Convincing people to search for groceries and other products through Google instead of Amazon also means more page views, more clicks and more advertising dollars for the company.