Bigger-than-expected discounts and strong demand for electronics and toys made Cyber Monday the biggest ever day for online sales in the United States, according to the Adobe Digital Index report. Shopping using mobile devices accounted for 26 percent of total online sales, up from 19 percent a year earlier, Adobe’s report said. The average order value from online shoppers was $123.43, down 0.6 percent from last year, IBM said, mainly due to a rise in mobile shoppers.