Does this not work? http://www.swtor.com/buy#optional-game-add-ons
I clicked on the order on Origin button and it seems to work fine...and I believe Origin started shipping to Europe a while ago, though obviously I haven't tried it myself.
That scroll-over says they're out of stock, but previous links given by CSR Droids have re-directed to the main-page of the Origin site.
Edit: Can't seem to find it on the Origin site.