Where can i get a REAL replica of Riku's soul eater?

I love Riku's weapon in kingdom hearts chain of memories, but i want to purchase a real replica, made of metal and everything, as if it really existed you know? I want a real deal not a styrofoam toy or a small fake replica. Where can i buy the real deal, or where can i make one? Either way i need to acquire one. Thank you.