When you click the link for a specific manual on the Print Shop page on the Raymarine website you will be directed to the relevant order page on Lulu.com. On that page, click "Add to basket". Then, when you get to the Shopping Basket page, you can use the Quantity field to change the number of manuals required. The postage costs will be re-calculated accordingly; for example, you will get a postage discount when ordering multiple manuals at the same time.