By Todd Obolsky, special to CNBC
NEW YORK ( CNBC) -- Happy Free Shipping Day. Or was it? For many online shoppers, a free shipping offer is the holy grail of deals. Forget 20% off an item or a coupon for a future discount: Free shipping is what makes people click the "buy" button. And Friday, the fourth annual Free Shipping Day, may have meant banner sales for the more than 2,200 merchants that signed on. Internet marketer Luke Knowles hatched the idea for Free Shipping Day after reading several years ago that 90% of consumers buy more when offered free delivery. On Free Shipping Day in 2010, Internet non-travel retail spending hit $942 million, the third-highest one-day total ever.
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