The ISBN (International Standard Book Number) is located on the back of every book. Pause here and take a moment to look around your home or office for a book to examine. Any book. Turn it over to the back cover. Above the barcode you will see the ISBN number. This number will have either 10 or 13 digits.
Now, go to your computer and type in http://www.amazon.com/ or http://www.half.com/. In the search box of either site type in the 10 or 13 digit ISBN number located on the back of the book you are examining. Hit enter. The price of that book will appear on your screen. This is the price you can expect to sell your book for on that website. The current sales price of the book will depend on the condition and demand for the book. Some books will sell for a lot of money and some books will sell for a small amount. Books can sell for anywhere from .01 to $250.00 per copy. The average sales price of a book is $55. The price of a book will go up and down depending on the condition of the book and demand for it. The shipping cost for the book is paid for by the customer who purchases the book.