Something I noticed tonight while browsing Amazon America - while I am logged in with an Australian address, if I am looking at something that is available to Australia, it has on right side (under the "add to cart" tab), a link to it's equivalent Australian web address, saving me shipping if I am a Prime member (over $49). The converted amount in AU$ is about 10% off from the actual rate (obviously to cover shipping), but the "free" shipping would still end up saving me about 20% on some of the items I was looking at.