This week Amazon has gone bigger than ever on its Prime Day deals. Beyond the big-ticket items, however, there's a real winner for fans of reading, thanks to this Kindle promotion. Kindle Unlimited is free, but only if you sign up before the end of today!

Kindle Unlimited gives you access to more than 4 million digital titles, including fiction, non-fiction, audiobooks, and magazines. It normally costs $11.99 per month, but during Prime Day, Prime members get three months free. I personally don't always read fast enough to justify the $11.99 a month, but I'll take three free months of it any day.

In 2025 that is not the case at all, though. Amazon has dropped prices on the entire Kindle lineup and these are the best deals I've ever seen on the latest models. If you've been waiting for Prime Day to pick up one of these popular e-readers for yourself or a loved one, I can honestly say there's never been a better time to do so.