(AP/CNN) - As the market for online shopping continues to boom, experts believe 2013 could be its biggest year yet.
Millions of shoppers are expected to click on items on Monday as retailers rev up deals to grab online holiday shopping dollars on the first working day after the busy holiday weekend.
But this year so-called Cyber Monday seems to have stretched into Cyber Week or even Cyber Month, with retailers from Amazon to Wal-Mart rolling out online deals since the beginning of November.
Cyber Monday is expected to be the busiest online shopping day of the year. Research firm comScore expects Cyber Monday expects sales of $2 billion, up from about $1.47 billion last year. Online sales account for about 10 percent of total holiday spending.