The everything store was never the extent of Amazons ambition. Oddly, books have been the holdout, as Amazons fights with publishers have largely kept it from experimenting with new forms of packaging and distribution. Its the Netflix for books idea that a number of companies have tried, all to middling success: pay one price, read as many books as you like. Amazons leaked documentation promises more than 600,000 books and thousands of audiobooks to Kindle Unlimited subscribers, and theres no question Amazons potential selection far outweighs its competitors.