Amazon’s October Prime Day Results Give Ecommerce Sellers New Insight for Black Friday Planning US online spending reached $9.86 billion during Amazon ’s October 6–7 Prime Big Deal Days, giving ecommerce sellers new data to consider when planning for Black Friday and Cyber Monday. The total covers US retailers, rather than Amazon alone, according to Adobe data reported by Retail Dive . Discounts encouraged purchases across categories including electronics, toys and apparel, while mobile devices accounted for 52% of online spending.