Google (GOOG) and Barnes & Noble (BKS) are banding together in an effort to rival Amazon (AMZ). Beginning on Thursday the two companies will pilot their same-day book delivery service in Manhattan, West Los Angeles and the San Francisco area. The books will be delivered via Google Shopping Express which launched about a year ago. Barnes & Noble is the most recent name to join Google Shopping's list of 19 retailers. Amazon remains the leader in same-day delivery service. On Wednesday, the online retail giant announced its expansion from four cities to 10. But, with the use of commercial drones on hold indefinitely, Google and Barnes & Noble's latest venture poses a potentially serious threat to Amazon and its long-held dominance of the online retail market. TheStreet's Julie Cerullo reports from New York.