The term "bargain books" refers to a collection or selection of books that are being sold at a discounted price, usually due to overstock, remaining unsold inventory, or as part of a promotional offer. These books may be new releases or older titles and can cover various genres such as fiction, non-fiction, children's literature, academic texts, etc. The idea behind "bargain books" is to attract customers by offering them good quality reading material at an affordable price, thereby encouraging impulse purchases or bulk buying.