Any ideas or suggestions on how to move some of my books?

You could try offering a deal in the book bazaar.  It doesn't cost much more to mail 2 or 3 books than 1.  If you have a lot of books that are plentiful in PBS this is a good way to get rid of some.  Then use the credits you earn to order books you want on a deal from someone else.  Or become a boxer.  It's $10/yr and you trade books for books-no credits involved.  Usually when you 1st become a boxer you get a lot of offers while your name is on the new boxer list.  If they have books you're interested in-you make a trade. If not, then you declined.  You can search boxer's shelves and make an offer to do a box trade.  This is another way to get rid of books that are common on PBS.