What started as a simple one-day summer sale at Amazon has morphed into a week of deals at major retailers. Here is what to look for to find the best savings.

Exciting deals are on the horizon as Amazon and Walmart compete for your business this week! Reporter John Matarese highlights the best offers from both retailers, including Amazon's extended four-day Prime Day and Walmart's six-day sale event.

Attention, shoppers! Top U.S. retailers are running their summer sales events this week, vying to attract bargain-hunters in what could be one of the busiest shopping periods of the year. Amazon ( NASDAQ: AMZN) Prime Day - potentially the biggest shopping event this summer - will begin on Tuesday (July 8) and has been extended from the usual two days to four.