Amazon books are often like that you see a book you want for[say] £18.00 then by the time you've scrolled down out of intrest the same books £200.00, I saw a book I wanted & there was 2 both near the £100.0 mark [too dear for me] I googled the authors name & it transpires he sold up all his books & equipment to a company in leeds, when I contacted them I bought the same book brand new for £10.00 plus postage & delivered the next day, it pays to shop around.