Black Friday has become something of an anachronism in the e-commerce era. The day after Thanksgiving marks the official start of the holiday shopping season, but retailers already have spent weeks flooding their websites and customers' email inboxes with early Black Friday offers.

Video above: A look at what Black Friday shopping used to be like in 2001 Advertisement

While sales trends have been shifting, the best bargains may still be from Black Friday through Cyber Monday. That may be especially true for big ticket items, seasonal merchandise and the latest trendy products.

Consumer advocates note, however, that deep discounts are not a once-a-year opportunity. They advise shoppers to comparison shop, research price histories and to read the fine print to make sure they are buying

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