The event, first launched in 2015 as a way to hook new Prime members, has pushed other retailers to launch counterprogramming.

Amazon.com Inc took a big gamble this year by expanding its annual Prime Day summer sale to four days from two, betting the extension would give shoppers more time to navigate the millions of deals on its sprawling web store.

Amazon Prime Day is happening July 8 through July 11, and it's one of the best online sales events of the year. Whether you're looking forward to getting a good deal on new tech, home goods or anything in between,