As of 2015, the options for purchasing books on the Amazon bestseller list do not vary much from the options associated with other books available on Amazon. These include purchasing hard copies, digital versions and purchasing the books used from non-Amazon sellers.
Many Amazon bestsellers come in a variety of print versions. For example, the Fifty Shades Trilogy is available in both hardcover and paperback. The hardcover edition is more expensive than the paperback version. When looking to purchase a printed edition of a best-selling book, users have the option to purchase the item brand new or in used condition. Typically, the used editions are sold by independent retailers utilizing Amazon's site. Used book purchases may not qualify for Amazon Prime and may have a different delivery schedule than purchases direct from Amazon.
Another option is the Kindle edition, which is available for most best sellers. This digital copy of the book is easily read by the Amazon Kindle or any device with the Amazon e-reader application. This is typically the cheapest way to purchase most books on Amazon, where it is available. Not all books on Amazon have this digital option, but bestsellers, by virtue of their popularity, are most likely to.