Ten years ago, paper books got some stiff competition: the first Amazon Kindle was released. Sunday, billionaire Amazon founder Jeff Bezos honored the 10-year anniversary on his personal Instagram page with a photo look-back at some of the older versions. "Ten years ago today, we launched the first-ever Kindle. Happy 10th birthday @AmazonKindle and thank you to all the Kindle readers and authors!" Bezos wrote. (Click through his post, embedded below, to see additional images of old and new Kindles.)

In the first photo, on the left is the original Kindle, and on the right is the Kindle Oasis, the most recent Kindle released on Oct. 11, 2017 which retails for $249.99. The Kindle Paperwhite, the current best-selling version of the e-reader, is on sale for $89.99, but typically retails for $119.99 on Amazon. As with virtually all technology, current prices are a whole lot cheaper than when the first much clunkier version came out a decade ago. The first Amazon Kindle retailed for $400, according to a 2007 Cnet review.