remaindered book; discounted new book
Refers to a new book sold at a reduced price, often because it is overstocked or slightly damaged. Not a used book.
I was able to buy the book I wanted cheaply at the remaindered book section.
This book is a remaindered book, so it's much cheaper than the list price.
Compound of 新 (new) and 古本 (used book), literally 'new used book', reflecting the idea of a new book sold like a used one at a discount.