The average e-book costs $2.00 to $3.99, according to a recent survey by Bowker, the organization that tracks publishing industry data. The survey also found that while fiction tends to be more expensive than nonfiction, there are exceptions: The average price of a romance novel is $3.99; for fantasy and science fiction it's $4.99, and for young adult fiction it's $4.99. E-books are often cheaper than their print counterparts, but they can be more expensive too. For example, the average price of an audiobook is $28.65 — about twice as much as a physical book.