I'd argue that there are few things more important than regular reading. While I love reading paper books, there's nothing more convenient than digital book readers that allow me to read on any device.
I buy lots of books through the Amazon and Kindle, and when I browse I'm always amazed at how many items show up on Kindle Unlimited. The service allows you to read lots of books without buying. It has over 1 million titles, audiobooks and current magazines.
Right now Amazon is having a sale that if you use an American Express card to pay, you can get 30% off the yearly price. This essentially drops the yearly price by $36 (from $10 a month to $7 a month). If you're a reader and like reading digitally, than this is a great savings.