"That's always a great time for shoppers to get out and get terrific bargains as well," Gatti said.

But the week after Christmas is also prime time for merchandise returns, an estimated $47 billion this year.

Consumers can also expect longer lines at some stores as customers redeem millions of dollars in gift cards.

Those wishing to avoid big crowds are increasingly turning to the Internet. Retailers say online sales are up more than 16 percent with a growing number of shoppers making purchases this year using their smartphones.