Amazon Prime Day officially got underway Tuesday, with the summer sales event slated to last through July 11. Competitors Target and Walmart are also holding multi-day sales events.

Though Prime Day doesn't start for another few hours, Target Circle Week kicked off yesterday, bringing huge deals across groceries, clothing, toys, and more. Even better, Walmart Deals starts tonight and ends Saturday,

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.