Shoppers spent $2.98 billion online on Cyber Monday, 12% more than 2014 and the biggest online shopping day ever, according to Adobe ADBE, -3.36% . Consumers spent $11 billion for the entire period between Thanksgiving and Cyber Monday, a year-over-year increase of 15%. Thirteen percent of product views yielded an out-of-stock message, twice the normal amount, with Star Wars toys and video game bundles and the Fisher-Price Imaginext Supernova Battle Rover among the items most out of stock. Some of the best selling electronics items were Samsung 4K TVs, Microsoft Xbox MSFT, -3.29% , and the Apple iPad Mini AAPL, -4.19% . The average discount was 20.3%. Nearly half of all shopping visits (49%) were made on mobile devices, resulting in $514 million in sales. Adobe says each of the first 18 days of December will tally $1 billion in sales. See also: When shoppers use smaller screens, they make smaller purchases