How is the cost determined?

When you purchase the pages, you receive a resource that is quite expensive to produce - we make our products in small batches to ensure maximum flexibility is given to the customer. Textbooks rely on selling thousands of copies and constantly changing editions with little actual change in content. Longbow's pages are standard which means that you can continue to build the resource, changing the order as you please, and you will never be stuck with a changing edition again. Each page is filled with as much information as possible - you do not pay for the blank back sides that occur at the end of some topics. The initial cost of Longbow's pages, should you choose to purchase most of the sections, is similar to a textbook, but it is a one-time purchase for teachers.