Prime Day Predictions From One Of Amazon’s Largest Third-Party Sellers And Newly Minted Unicorn, Perch. Amazon Prime Day is one of the most anticipated sales events of the year. Last year, in 2020, Prime Day generated $10.4 billion worth of goods sold, more than double that of 2018’s figure of $4.19 billion. While 2020 was a landmark year for the event it was also an unusual one.