Retailers are expecting up to 72 million U.S. consumers to shop online from their home or workplace on Monday, up from 60.7 million on the same day last year, according to the National Retail Federation.

A survey of more than 7,900 consumers conducted this weekend by BIGresearch found that more than half of all respondents with workplace Internet access were planning to continue gift shopping online at the office on so-called "Cyber Monday," the first working day after the Thanksgiving holiday weekend.

"Retailers will be unveiling a variety of incredible one-day sales on Cyber Monday to bring consumers to their websites," Scott Silverman, the executive director of the trade group's online division, said in a statement. "Online retailers consider Cyber Monday a virtual Black Friday and will be offering promotions that will be tough to beat later in the holiday season."