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120+ of the best Prime Day deals under $100, as chosen by our editors

If you're looking for a true Prime Day bargain, check out the best deals under $100, some items are down to their lowest price ever.

By Brandt Ranj

Posted on Jul 17, 2024

The best Prime Day deals under $100 on a plain white background.
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Prime Day 2024 is in full swing, and it’s easy to feel overwhelmed by the millions of deals being thrown at you in rapid succession. Don’t worry, the PopSci Goods team has sifted through them and found TK of the best Prime Day deals you can get for under $100 across all categories. Remember, if you don’t have an active Amazon Prime subscription, you can sign up for a free, 30-day trial here.

Ultimate Ears WONDERBOOM 4 $79.99 (Was $99.99)

Ultimate Ears Wonderboom 4 outdoors.

Brandt Ranj / Popular Science

The Wonderboom 4 is Ultimate Ears’ latest ultra-portable pool-friendly speaker, and it sounds far better than you’d think, given its modest size. In our early tests, the Wonderboom 4 has deeper bass and clearer midrange performance than any speaker we’ve tested in its held-in-the-palm-of-our-hand size class. We’re also fans of its design, from the mesh covering made partially out of recycled plastic to the giant volume buttons that are easy to press and impossible to miss. Ultimate Ears says the Wonderboom 4 lasts up to 14 hours per charge, and its IP67 rating means it can be fully submerged underwater without being permanently damaged. Though it probably won’t be because it floats. Don’t skip this deal if you need an ultra-portable speaker that can still pack a punch.

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Brandt Ranj

Staff Writer, Commerce

Brandt Ranj is an experienced writer for PopSci, covering topics such as science, technology, news, and gadget reviews.

Why Trust Popular Science

Popular Science started writing about technology more than 150 years ago. There was no such thing as “gadget writing” when we published our first issue in 1872, but if there was, our mission to demystify the world of innovation for everyday readers means we would have been all over it. Here in the present, PopSci is fully committed to helping readers navigate the increasingly intimidating array of devices on the market right now.

Our writers and editors have combined decades of experience covering and reviewing consumer electronics. We each have our own obsessive specialties—from high-end audio to video games to cameras and beyond—but when we’re reviewing devices outside of our immediate wheelhouses, we do our best to seek out trustworthy voices and opinions to help guide people to the very best recommendations. We know we don’t know everything, but we’re excited to live through the analysis paralysis that internet shopping can spur so readers don’t have to.

Find out more about our product evaluation process.