I am a 10 in most boots and the 43 fits me perfectly, so they might be a little snug on you as nn said. I got mine from the attachemnt webshop. But they are out of 43. Here are some other places that stock the boots.
Unless you are in Japan you will have to use a proxy service. Most of those places don't ship outside of Japan.
Edited by jwalterweather - 8/14/15 at 10:19am