Wow, this is a really good deal.  Whether you make 3 different books or order 3 of the same it is buy 1 get 2 free from by HP.  

Create 1 20 page 8x11 book and then choose 2 others that are the same size and amount of pages.  Use code MYFALLBKS at check out.  This offer is valid through November 8th.  And remember they are still running then 300 prints for $3.  A great time to get all those Halloween pictures printed!