Black Friday falls on Nov. 23 this year, but retailers already have begun to promote the huge discounts they plan to offer in its name. Some deals already are available to shoppers. Although Cyber Monday has grown in significance, Black Friday "is still significant as the kickoff to the holiday season," said Ray Wang, principal analyst at Constellation Research. Black Friday sales are no longer limited to brick-and-mortar stores. For example, Amazon kicked off more than 50 days of "Black Friday Deals" last week.