Today is Free Shipping Day, and a number of retailers across the web -- 1,181 and counting, according to FreeShippingDay.com -- are celebrating appropriately.

WZZM 13 in Michigan has a sample roundup of 12 "huge deals," including free shipping at Amazon, J. Crew, Express and more. Nike is offering free two-day shipping; Ugg is offering free overnight shipping. Even better: These included retailers guarantee delivery by Christmas.

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Of course there's a catch. Per KMGH in Cleveland, the deep discounts in shipping don't translate into great deals on everything else: "This is not Black Friday, and says you should not assume you are finding a great deal." And those discounts can still come with minimum purchase requirements.

What's more, some retailers (such as Target and Walmart) already offer free shipping throughout the year.

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Still, Free Shipping Day has reportedly grown enormous, topping $1 billion in sales, according to WTOP in Washington, D.C.: "In fact, one survey found 90 percent of consumers spend more when they're offered free delivery."

Are you scrambling to get your presents sent off? Here's a list of the absolute last deadlines to guarantee delivery by Christmas.

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