World of Books is a small business based in West Sussex, England. Their business entails purchasing unsold inventory of used books from UK charity shops and reselling them on various online sites such as Amazon.com. The company purchases books in bulk, paying by tonnage rather than paying for individual titles. World of Books also own the 'instant cash for stuff' website Ziffit.com that pays people low prices for their books, dvds, cds and games so they can be sold on for a higher price. Using custom-designed software, they evaluate each title for saleability and set selling prices accordingly. According to Stephen Boobyer, managing director, "It’s a constantly moving matrix and even once listed, a book’s selling price is constantly adjusted so it matches the lowest offered by World of Boo