Am been trying to put my order for two days, but it's been unsuccessful, because when I press to my address appear a page of list of books that I want to buy with my address, and it's say too some of the books not available at the moments only used, I choose them to buy as well, then I confirm my address in Australia where should be delivered, and then I press the button to "continue" but did'n happen, then appear once again the same page. Could you help me please?