Kindle Unlimited is an Amazon book subscription service. For $9.99/mo, you get unlimited access to over 1 million titles. Read as many books as you want for under ten dollars. It's a great deal for voracious readers on a limited book budget. If you haven't tried it before, they offer a free 30 day trial.
You don't need to own a kindle to read. There are free kindle apps for any device you own: phones, tablets and computers. The link to the free app it on any book description page under the book image.
click on READ ON ANY DEVICE ^^^^ for your free kindle app
Box sets are a great bargain on KU and I have three available there.
From my Hope Franke catalog – inspirational romances from the Guitar Girl Romance series.