I was out and about in town yesterday and wandered in to the local bookstore. On their shelves I found this book
So got home and went on Amazon to find that the cheapest secondhand price for this book was £25, and there were sellers listing it as new for £90. I nearly fell off the chair! So straight back down to the bookshop I went (I'm only 10 minutes walk away) and promptly picked it off the shelf again.
Moral of the story I will never ever again assume that things will always be cheaper on line, research will be done before making future purchases when buying new!!