Google is trying to catch up with Amazon in same-day delivery service. The tech giant is adding two more densely populated areas to its Google Shopping Express same-day delivery service.

Same-day deliveries are now available from select retailers in Manhattan and West Los Angeles. Google has also been testing the service in San Francisco for more than a year.

"With Google Shopping Express, there's no need to schlep around town in a cab or sit in traffic while carrying home clunky, heavy items," Jenna Owens, general manager of operations for Google Shopping Express, wrote in a blog post Monday. "All you have to do is browse products from many of your favorite local stores at google.com/express, select a delivery window that works for you, and receive your order later that day."

In a bid to attract customers, Google is offering unlimited free deliveries for the next six months, and tacking on a $10 spending bonus to let you try out the service. 

Eventually, Google Shopping Express will require a paid membership, but Google hasn't said what the subscription price will be. Without a membership, Google will charge $4.99 per store, per order.

In Los Angeles, the service is now available in Culver City, Inglewood, Marina Del Rey, Santa Monica, Venice, West Los Angeles, and Westwood. Google plans to expand to Bel-Air, Beverly Hills, Pacific Palisades, Playa del Rey, Playa Vista, and West Hollywood in the coming months.