Unfortunately you cannot trade book for book, unless you are a Box of Books member.  Also the Harry Potter Cookbook is wishlisted, so you can't ask for that book unless you are #1 inline.  Sorry. 

(5) No swapping books-for-books unless the swap is between two "Boxers" (Boxers = subscribers to Box-O-Books). For example, posting "I will send you this book if you will send me that book" or "I will send any three books from my bookshelf for this one book I want" is not permitted unless both members are Boxers. If you are a Boxer, why not peek into other Boxers' bookshelves from the Box-O-Books area to see if books you want are available? You can save a lot of postage and credits this way!

(6) No trying to jump the Wish List "line" by offering or asking for postable Wish Listed books. Postable Wish Listed books should be posted and swapped "officially". This of course does not apply to posts advertising an alternate ISBN (or non-ISBN version) of a Wish Listed title; it is fine to advertise that you have those posted to your account Bookshelf.