Kindle Unlimited is a fee-based Amazon program that lets you borrow books for a subscription price ($9.99 month). You can keep up to ten books at a time, with no return date.
Authors love to have you buy books, so why encourage KU? Think of KU as a library. We buy books we know we will reread or perhaps books of favorite authors, but others will only be enjoyed once. KU pays authors based on the number of pages read. (Ah, technology. Who would have thought this would be possible?) If you don't have a Kindle, download to your computer, phone, or Android device with the Kindle App.
I keep most books on all book seller sites, but I rotate some through KU, and keep some box sets in the program. The selections are below. Read away!