Milwaukee’s two-pack of high-output batteries is another great deal, currently an impressive 50 percent off—a savings of $150—at Walmart. These 18-volt batteries are compatible with over 150 M18 cordless tools and have a 6-amp-hour capacity. They also come with overload protection and a three-year warranty.

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 best headphones for most new iPhone users are at their lowest price ever at Walmart, even less than Amazon's Prime Day sale.