Where do I find my order number?   The order number can be found in the upper right-hand corner of the email sent to you by Thrift Books with the subject line "Order Confirmation" or "Shipping Confirmation." Also, if you purchased your books through Thriftbooks.com you can find your order number on the Order History page, found by clicking on the “Order History” link in the green Shopping Cart box located in the upper right-hand corner of your screen.