(Associated Press) Emboldened by rapid growth in e-commerce shipping, the cash-strapped U.S. Postal Service is moving aggressively this holiday season to start a premium service for the Internet shopper seeking the instant gratification of a store purchase: same-day package delivery.

Teaming up with major retailers, the post office will begin the expedited service in San Francisco on Dec. 12 at a price similar to its competitors. If things run smoothly, the program will quickly expand next year to other big cities such as Boston, Chicago and New York. It follows similar efforts by eBay, Amazon.com, and most recently Wal-Mart Stores Inc., which charges a $10 flat rate for same-day delivery.

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