I was charged in pounds sterling at the listed price that came up when i selected that currency and pressed update basket on the order screen.
I suspect your charged in the currency local to your shipping location and it's up to you to make sure you select the correct one as the prices do vary greatly from one currency to another.
i.e i ordered Jesse Jane: Kiss Kiss Blu-Ray= $49.95 or Euro 39.95 or £29.95
Not sure if thats any help or not

