I'd like to see if one of the people that has a book listed has other books listed that I might want. Is there a way to find out besides ordering it then looking at their other books then cancelling the order if I don't find anything?

that is the only way to find out is by ordering the book.

if they have a book you want, why would you cancel the order if they didn't have other books you wanted?

If that person doesn't have more of the books you're looking for, you could make a "Looking for..." post on the Book Bazaar.

For example: Looking for Evanovich books... and in the body state which ones you're looking for, and that you'd like to order multiples from one person. You could also see if anyone is willing to offer a deal for the multiples.

Make sense?

Or you could become a boxer, and then you could make multiple book trades without using credits. When searching for books as a boxer, you can search for books that boxers have available, but you will still need to look through their shelves to see which books to add to the box.