One of the brilliant things about Amazon is the customer reviews. For example, twice today I've been pointed towards Amazon.de (Germany) as a better alternative. Firstly I was looking into the new Samsung Galaxy Note big-screen phone, and it's not exactly a cheap thing. But then a few reviews down I saw a note which said that it was cheaper from Amazon.de. No kidding, like 120 Sterling less, not far from $200 cheaper!
Secondly, Kungfu Panda 2 is out in UK, but only on DVD, for lord knows what reason. A reviewer pointed out you can already get it from Germany on blu-ray. Boom, it's ordered.
And another great thing is that you don't have to create a new account for an Amazon store in a different country, you just log in, and you can buy with one-click and all. Kewl. I once bought People Like Us Series 2 from Amazon Australia, it was only released there. (Which I found out about from Wikipedia, another stellar modern blessing.)