hrough Oct. 7 and gives Prime members 48 hours to shop millions of deals across more than 35 categories, including beauty, fashion, tech, kitchen and home. Amazon is also releasing new limited-time Today's Big Deals three times each day - at midnight, 8 a.m. and 1 p.m. PDT - with some offers available only while supplies last. This year's sale comes a little more than three months after Amazon's main Prime Day event, which ran for four days from June 23 through June 26. Prime Big Deal Days effectively serves as the retailer's fall sequel, arriving just as shoppers begin stocking up for the holidays. Most deals require a Prime membership, which costs $14.99 per month or $139 annually, though eligible new members can sign up for a 30-day free trial.