The online bookseller Abebooks has published their list of the top 10 most expensive books sold on their website in 2008. Here is one of the books from their list:
Harry Potter and the Prisoner of Azkaban by JK Rowling
This was a rare first edition signed by JK with the dust wrapper panels signed by the cover artist Cliff Wright. The first issue has a misaligned block of text which was corrected in the subsequent issues.
Price of this copy at Abebooks: $12,874
Price of a regular copy at Amazon: $7.99