All my books are 2/1 after the first request so that means you get 1 book for 1 credit or 3 books for 2 credits, 5 books for 3 credits, 7 books for 4 credits, 9 books for 5 credits and after that I will do even better deals....12 books for 6 credits  and will consider any reasonable offer also. I prefer to send a lot of books at once, but will gladly send only one if that is all you find. Thanks for looking.