Many of us have done some online comparison shopping while we're standing in a physical store. Just ask Best Buy. Google, however, is betting that at least some of us want to splurge on a better deal without even leaving the search page: it's expanding Google Shopping product listing ads to include smartphone search results. Run a relevant query and you'll see a small block of store listings, with options to either jump right to a tempting product or visit a location-aware Google Sho
