Log on with your creadential in Origin.
After you log-in open a new tab with:
www.xroxy.com/proxy-country-US.htm
(usually I open the proxy list on another browser just to test it works. after a sucessfull test I apply the settings on the browser I am logged in Origin).
Then apply a US proxy adress to your web browser.
Go to Origin shop.
Now it will show your are located in US, even if your account is registered in EU.
You can now buy a 60 day card cheaper then it sells in EU.
This will be even more lovely when they release 90 days cards.
After you buy, log out safelly. You will receive the code by email.
Enjoy!