I purchased a book from an American company called "The McGraw-Hill Companies". On my order form it said that shipping was free, on that basis I purchased the book.
I then received an invoice from this company stating that they had debited my account $47.05. The cost of the book was $19.99 and shipping was $27.06.When I sent them an email about this,it was pointed out to me that there was a Disclaimer on the billing information page and that the cost was not yet determined. A check of my order revealed that it was still being processed. When this was pointed out to them they replied stating that they were sorry and it was a misunderstanding.No effort was made by them to reimburse me.
So watch out for this company they are sharks. I have heard nothing since from them.