They discounted dozens of products and saw great success — so much success, they doubled it to two days. Then four days. And now, it's no longer just Amazon Prime Day — it's the biggest sales week of the entire summer,

The most popular stores, like Walmart and Target, are holding their own competitor sales during Prime Day. Here are all the sales to check out

Amazon Prime Day is one of the biggest online sales of the year, but there are plenty of other alternative sales to shop as well. Although Prime Day will be held from July 8-11, several retailers are offering competing sales, some of which run throughout the month.