Well, you do live in Australia.
Amazon charges anywhere from five dollars to 30 dollars to ship books and DVDs to Australia, depending on how big a hurry you're in.
My family has an Amazon Prime account. For about $75 a year, we can order as much as we like and get two-day free shipping.
Because gas is twice what it used to be, I'm not surprised shipping costs in general are going up. UPS and FedEx would be amused to know they are in cahoots with each other.