Online sales at the country's top 100 retailers totaled more than $7.9 billion on Black Friday and Thanksgiving.
Smartphone transactions hit a record high in the USA on Black Friday as shoppers thronged retail stores as well as went online to celebrate.
Shares of retailers such as Macy's Inc and Wal-Mart were up on Monday following a promising start to the holiday season and ahead of what is expected to be the largest USA online shopping day in history. Several chains tightened store inventories as well, to ward off any post-holiday liquidation that would weigh on profits.
TVs, laptops, toys and gaming consoles - particularly the PlayStation 4 - were among the most heavily discounted and the biggest sellers, according to retail analysts and consultants. Separate figures suggested that, rather than going into brick-and-mortar stores, an increasing number of consumers turned to their mobile phones during the entire month of November to shop for deals.
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And they just keep buying - online.
The credit card processing slowdown began hours after Macy's chief executive, Jeff Gennette, told CNBC that the retailer was better off this year than last, had robust online demand and was in a good place for holiday promotions. There was little sign of the wild shopper frenzy customary of Black Fridays from last years. In fact, a survey from the National Retail Federation and Prosper Insights & Analytics found that 46 percent of shoppers ages 18 to 24 plan on spending more on holiday gifts this year than they did last year.
Data for Cyber Monday sales are expected at around noon eastern time.
US consumer confidence has been strengthening over this past year, due to a labor market that is churning out jobs, rising home prices and stock markets that are hovering at record highs.