Rather than me send you the books and lose money when mailing rates change or the production cost goes up due to me getting carried away and creating more content for stretch goals than I had initially costed for, the books will be fulfilled through DriveThruRPG.com using their Print on Demand service. When the book is ready you will be sent an at cost coupon linked to your DriveThruRPG.com account email address, and you will then pay the production cost and the postage that you want. I've done this successfully for the last two Kickstarters I've done. It means that all the money raised is going to meet development costs. Also backers get their books at a slight discount to the final retail price.
This effects all the printed pledges, apart from the Retail and Golden Monkey where I order and then send out the books to you and printing and postage is included in your pledge