“Just wanted to let you know that I had a great experience selling through your company. I had some textbooks that I no longer needed and were in good shape. I got the exact price for them that I was quoted. There was no hassle with the Fedex shipping. I just sent the textbooks in the mail yesterday and received notification today that the money was already in my PayPal account. Fantastic service! Thank you so much.” - Kaity C.
Be honest about the condition of the book. If there are damaged corners or missing pages, say so. If someone has written in or highlighted huge portions of the book, make that known. If the book has remainder marks (an indication they've been returned to the publisher), mention that, too. Fudging on the condition won't get you more money. When the buyer receives your book and finds it lacking, they'll adjust their offer down, and may even reject your book completely.
Who’s buying? Richard Davies, PR manager for the popular online marketplace Abebooks, describes the customer base as rather broad. “There are people who just want a cheap book,” he says, “and the used book market fulfills that really well.” Others, meanwhile, have more idiosyncratic requirements. “The book they need is not going to be in a Barnes & Noble.” So they turn to online retailers, where the “breadth of inventory really caters to people who have got a demanding taste”.
I like to start with BookScouter.com. BookScouter says they’re just for textbook buyback, but I’ve had some good luck checking prices of regular trade books. Book Scouter will tell you what websites will currently pay for each book you’re trying to sell. This will give you a good idea of whether or not it’s even worth selling your books. Remember, all of these websites pay based on what they think they can sell book for, so books with higher demand will sell for more.