Black Friday 2015 & the day after generated $4.5bn in online sales in the US

"The first two days of the holiday sales period have netted $4.45 billion in U.S. online purchases, with mobile devices — led by smartphones — accounting for a record $1.5 billion of that amount, with $2.72 billion spent on BlackFriday and $1.73 billion on Thanksgiving. The figures come from Adobe, which has been tracking some 4,500 sites, including 80% of the top 100 retailers.
IBM says Black Friday outpaced that with the average basket size of $134.45, and sales up 20.7% on a year ago with popular items including Apple Watch, Microsoft’s Surface Pro 4, and TVs from Samsung, Sony and LG.
The number of people buying goods online and by mobile during the holiday season continues to grow, but the average value of what they are buying may be falling. IBM says that Thanksgiving online sales — amassed by way of its Benchmark survey tracking thousands of sites — overall were up 26% compared to a year ago. But the average spend per order on Thursday as $123.45. That’s down from $125.25 a year ago, and nearly $10 less than 2013, when the average basket value was $132.
Adobe said that its $2.72 billion in estimated spend online on Black Friday showed growth of 14%. Adobe had expected growth of 19%."

Source:  Techcrunch, 28th November 2015
Update - Total for Black Friday - Cyber Monday was $11bn
Update - Walmart's statement on Cyber Monday
Update - Millions of Amazon devices - Kindle Fires, Fire Sticks - sold
Update - £1.1bn spent online in the UK on Black Friday - first ever shopping day over £1bn