He's right, I'm afraid. EU doesn't like the MDR-7520 due to the fact that they are super efficient and thus infringe some idiotic loudness rules (my amp can make any headphone "too loud"). So yeah, it's either US or some other exotic location for us to source them as well.
If you can find good used deals, then just swap out the pads and send them over. Might be cheaper than us trying to hunt them down.