These Credit Card-Sized E-Readers Are up to 21% Off Until October Prime Day Ends Tonight

We may earn a commission from links on this page. Deal pricing and availability subject to change after time of publication. Prime Day is usually a great time to score a good deal on a Kindle, but before Amazon's "Prime Big Deal Days" event ends tonight, let me redirect your attention to another category of e-readers entirely. Tiny e-ink devices—I'm talking credit card-sized, with screens that measure around four inches—are all the rage in 2026. If you too can see the appeal of carrying all of your books with you on a device so small you'll forget it's even in your pocket, it's not a bad time to jump in: Two of the best options on the market, the recently released Xteink X4 Classic and the even smaller X3 , are up to 21% off for October Prime Day, but you'll need to act quickly: The discount will soon be gone.. Xteink X4 Classic 4.3-Inch Pocket E-Reader $69.99 at Amazon $89.00 Save $19.01 Get Deal Get Deal $69.99 at Amazon $89.00 Save $19.01 Xteink X3 3.7-Inch Pocket E-Reader $58.65 at Amazon $69.00 Save $10.35 Get Deal Get Deal $58.65 at Amazon $69.00 Save $10.35 SEE -1 MORE Xteink is a Chinese startup that shook up the e-reading world last year with the launch of the X4 , a super bare-bones device that made up for its lack of features and usability with a cheap sub-$70 price point. Since then, a huge online community of fans has formed around the device, sharing tips on Reddit and even coming together to crowdsource an alternate operating system that fixes a lot…