Prime Day shopping events to entice cautious consumers and play defense against stiffer competition from the likes of Walmart Inc., Target Corp. and TikTok, who have launched their own discount days in response.

The event, started in 2015 as a way to hook new Prime members, has pushed other retailers to launch counterprogramming.

Amazon’s summer Prime Day — which is now a four-day event rather than the usual two days — is well underway, and we’ve been working hard to surface the best deals for our readers. We’ve sorted through thousands of on-sale items to pinpoint truly excellent discounts on the things our experts have found are worth your time and money.