There is not a vast range on this site, and they haven't been updated in ages. I have seen a couple of them in waterstones and they are quite expensive too. You will notice that the subject areas on this site are very limited, you will find much more in a bookshop. Also with regards to research guides, don't go overboard and buy too many, they all say the same thing in a roundabout way. I have 'Authoring a PhD Thesis' by Patrick Dunleavy, this is very good, but costs about £20.