answer: #Person1# suggests Susan buying some used books for school and Susan buys an Eglish writing book and a novel. She doesn't buy more textbooks because she thinks teachers always changes minds about textbooks.
documents: #Person1#: Hey Susan, are you interested in buying some used books for school? You can really save some money that way.
  #Person2#: Well, what do you have?
  #Person1#: Well, let's see. I have a science book called Today's World and I am selling it for 30 dollars.
  #Person2#: 30. That's too expensive for a broken book like that.
  #Person1#: Maybe so, but I bought it for 60 and I wrote a lot of notes in the book that should help you with the class if you could read my writing.
  #Person2#: What else are you selling?
  #Person1#: OK, I have an English writing textbook for 14 dollars, a math book for 23 and a novel for only 7.
  #Person2#: Hmm...
  #Person1#: It's up to you. You know these things go fast.
  #Person2#: OK, I'll take the writing book and the novel. I need both of those for sure.
  #Person1#: No more textbooks?
  #Person2#: Not now. Teachers are always changing their minds about textbooks.
  #Person1#: All right.