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A large group of retailers is observing "Free Shipping Day", a promotion to encourage more spending on one of the last days online shoppers can order items for delivery by Christmas Eve.

J.C. Penney: Enter the code SHIP3 for free shipping on all orders, and use the code DEALS33 for 25% off purchases under $100 or 30% off purchases of $100 or more.

For those who still have online holiday shopping to do, Friday is "Free Shipping Day" - when merchants waive shipping fees for purchases to arrive in time for Christmas.

Amazon has expanded the new services to Arizona, California, Florida, Illinois, Indiana, Maryland, Minnesota, Nevada, New York, Oklahoma, Texas, Virginia, Washington, Wisconsin and others.

Hundreds of stores like Target and Toys R Us are participating this year. But there are some limitations and the free shipping is available only at participating retail outlets. Here's a complete list of retailers.

Tommy Hilfiger: Enter the code LATEBIRD and you'll get 40% off sitewide, plus free standard shipping on Friday.

What retailers are offering free shipping on Free Shipping Day? Those items can only be shipped to the Continental U.S. and to non-P.O. Anyway, according to the site that runs it, Free Shipping Day has only a handful of rules.