Hold up! Don't pay that shipping fee because a major free shipping day is in the works.

More than 300 retailers have agreed to offer free shipping on Dec. 17. This happens to be one of the last days you can buy something online, select standard shipping and have it delivered by Christmas.Participating merchants include:

• Adidas
• American Eagle
• Apple Store
• Babies R Us
• Beauty.com
• Borders
• Eddie Bauer
• Endless.com
• JCPenney
• Kmart
• Macy's
• Nike
• PacSun
• PetSmart
• Red Envelope
• Sears
• Sephora
• Shoes.com
• Toys R Us

To see the full list of participating merchants, go here. I bet even more retailers will jump on board. Each merchant sets their own offer, so expect some to have minimums or other hoops to jump through.

The event is being coordinated by FreeShipping.org, a website that shares free shipping codes throughout the year. This is the second year they have organized a free shipping day right before Christmas. Will free shipping day become as much a part of the holiday shopping season as Black Friday and Cyber Monday? Let's hope!