ST. LOUIS β€” Amazon customers in St. Louis now have a new service to try out next time they order through the retail giant.

Tuesday, Amazon announced an expansion of Amazon Key β€” a service which enables in-home delivery and keyless guest access β€” with the addition of in-car delivery. The service, called Amazon Key In-Car, allows Prime members with compatible vehicles to have packages delivered to their cars when its parked in a publicly accessible area.

Amazon Key In-Car comes free of charge to Amazon Prime members, the subscription services which offers free two-day shipping and exclusive discounts. The service begins Tuesday in 37 cities across the country including St. Louis.

β€œThe in-car delivery option is another way Amazon helps ensure that my order is delivered safely and conveniently," an Amazon Prime member said in part in a statement. "I can't wait to check my car's trunk to see what's delivered next!"

In-car delivery will be available to Amazon customers with a compatible 2015 or newer Chevrolet, Buck, GMC or Cadillac vehicles with active OnStar accounts. Additionally, Volvo drivers with current Volvo OnStar accounts are granted access to the service.

To see if your car is compatible or to sign up for Amazon Key In-Car, click here.

Last month, Amazon announced a fulfillment center will be based in St. Peters, a first for the state of Missouri. The 800,000-square-foot center will house 1,500 jobs when it begins operations next May.