Did you try UK's Amazon site? I think you can just order codes off of that.
They want not-american money, which I can't do right now. When I tried, they said you are not in the right region for it and booted me back to amazon US. I just tried ordering one via play-asia, but have yet to get the code...so I'm gonna give it til tomorrow and see. Meanwhile please feel free to offer more suggestions my lovely rpgfan friends.