The sword is a retail Day One Edition item, and unfortunately there is no PC retail release in the US as the game is not ESRB rated on PC. Some markets do have PC retail and it is possible to import if you want to. We do apologize for the inconvenience!
You can also check out this thread. It has links to several of the other threads on this topic and there is a link to a site that is not region blocked provided by another forum member…