Hello Phil,
You have not ordered the book twice. The one in your cart is unsubmitted, it is just in your cart. I have removed it so you should no longer see it in your cart. The one you ordered is the Print/PDF Bundle, it has both the print version and the PDF. You may see them on your order history separately but they are component parts of the same item and you were only charged for the bundle, not the individual parts. I was going to cancel the bundle and make it just the PDF for you since it sounded like that is what you prefer, but the warehouse got the order shipped out earlier this morning before customer service got in. So the book is already on it's way to you and the PDF is available for download on your My Downloads page.
If you don't want the book you can write return to sender on it when it gets to you and it should come back to us. Once it does we can refund the purchase price of the book for you so you only pay for the PDF. You will be responsible for the shipping though.