Mashable's Shopping team has been covering Amazon Prime Day since 2018, and this year, we've got our work cut out for us. The retail giant just announced that it's extending its flagship members-only sale to four days for 2025.

Snap Circuits is a classic STEM toy that is often recommended for grade-school kids and older. This set has directions for hundreds of projects kids can build, including a home-run derby game and a spinning LED message board. An excellent indoor activity for days when the heat and humidity is too much.

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