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,

Target will match a Prime Day price as long as the item in question is identical to the one listed at Amazon — down to the model number and color. Target will ask for proof of the lower price at Amazon in the form of a direct listing or ad. No, screenshots and pictures don't count.

Amazon.com Inc.’s Prime Day sale helped boost online spending across all retailers in the US by 30.3% to $24.1 billion, according to Adobe Inc., topping its estimate for 28.4% growth for the period ending July 11.