i buy only at amazon and ebay(sellers with 100+ 100%positve ratings) online because they are cheap and i want to be sure and secure about my shipping. I dont trust other online shops.
I'm in Australia too, so impossible to ship some things, and hideously expensive for the ones they do. For books, shipping costs more than the actual books themselves! There are other better places like book depository which ships free internationally.
I love Amazon. Just got my new kindle and am loving it. For the price, nothing beats. Also, there books are cheap if you are buying a new book that has high circulation. Otherwise half.com is good, but S&H is expensive.
I bought books from Amazon just a few days ago. I am also looking to purchase a Kindle, it looks like a great piece of technology.