If your a habitual reader of books , then alienfaucet.com have a lot of books for you. If they dont have the books you want , then request it but one that probably you would like is that you will be paid just by reading the books. This is the first that i had encounter, you will be paid in bitcoins, if you dont like bitcoins then change it to cash but then read first. There is no site that will pay you in "cash" its only now and its in "bitcoins"
What is so interesting again is if you want to share a book that you have read then you can SHARE IT ;