UPDATE 2-Cyber Monday set to become biggest U.S. online shopping day
November 26, 2018 at 11:18 AM EST
Cyber Monday was on track to bring in a record $7.8 billion in U.S. online sales, but will also test the limits of retailers' e-commerce operations as millions of shoppers scour for steep discounts on everything from Lego sets to big-screen TVs.