Amazon’s Kindle has a program called Kindle Unlimited. For $9.95 a month, you can ‘rent’ 10 Kindle books at a time. It used to be a better deal than it is now, because fewer books are available on Kindle Unlimited, but it’s still a pretty good deal if you read a lot and you don’t want to keep copies of the books you read.
This will work for most any information product that you deliver over time.
For example, if you’re having a course with weekly classes, a training program in which you release one video every so often, or anything that is not released all at once, here is how to double your sign-ups.
There are all kinds of memberships you can run:
You can put out a simple monthly PDF newsletter or video.