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This year, both Walmart and Target chose to beat Amazon on shipping, but Amazon just responded with its own shipping offer.

More than 3 million items will eligible for same-day delivery during the holiday season, if you're a prime member.

The U.S. -only promotion, effective from November 5, waives the $25 minimum that customers outside Amazon's Prime loyalty club must hit for free shipping.

Just in time for holiday shopping, Amazon will offer free shipping on all orders arriving in time for Christmas.

For the current quarter ending in December, Amazon said it expects revenue in the range of $66.5 billion to $72.5 billion.

"Free shipping is one of the easiest promotions to execute for a retailer, and is certainly popular among consumers, however it is a very costly initiative to undertake", Moody's Lead Retail Analyst Charlie O'Shea said in a statement. Despite the longer shipping times for its new free shipping promotion, Amazon says it will have the "largest free shipping selection in the country".

The Amazon logo is displayed on screen of a mobile photo in a stock photo. In a release, the company said the offer is available for a "limited time" without providing specifics.

Instead of the usual $25 order minimum before shipping and taxes, Amazon is offering free shipping almost all orders shipped and sold by Amazon.

US online retail sales in November and December will rise 14.8 percent, to $124 billion, software maker Adobe said last week in a forecast based on data from 80 of the 100 largest online retailers.

The offer will be incredibly beneficial for Amazon, and although it has more than 100 million Prime subscribers, a majority of its customers continue to be non-Prime subscribers.

Prime members in the US can also shop FREE Same-Day Delivery on more than three million eligible items!