PR Newswire says that "Monday, December 14th, will be the busiest mailing day of the year according to the US Postal Service and FedEx. For shoppers, this means that free shipping deadlines are rapidly approaching. According to's analysis of the Top 500 online retailers, nearly two-thirds say their free standard shipping deadlines to ensure Christmas delivery will be on or before December 18. The average order size to qualify for free shipping is $52."

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