Perhaps this is old news,
But I recently went on a hunting spree for Amazon free ebooks.
When you have prime, Amazon allows you to download a list of free ebooks, some of which are permanently free, some of which are temporarily reduced to zero price.
Before I would regularly update and download free ebooks, so I had about 1000 free ebooks this way. Some of which are quite expensive otherwise (for an ebook).
I tried this again last week, and Amazon notified me that I need to 'return the ebooks', before I could 'purchase' more books!
Turns out their free ebooks, aren't free anymore, but has turned into a library borrowing system
