Netflix for Books
I was looking for an "online book club" when I was unemployed due to bordem. I stumbled across two different stores that are like netflix for books! It doesn't really pay for me anymore because I don't have time to read even two books in a month. However, for you fast readers it may be worth looking into.
Has paperback books and audiobooks for rent that start as low as 2 books at a time ($13.99/month for paperback) and go as many as 15 at a time ($49.99). You can also pay by semi-annual or annually and save yourself some money. Audio books are a little bit more per month. They have over 228,000 paperback titles and 28,000 audiobook titles.
Has paperback books as well but is slightly more expensive. Their lowest plan is 3 books at a time ($23.95) per month. They do have a plan for 1 book per month which is $9.95 per month plus $3.99 per book.