Halloween // I need help with my Ash Williams costume!

Hey, all! I come to you with a dilemma that I'm sure is ne'er uncommon in the community. I really want to go as Ash Williams from the awesome Evil Dead movies, but I have had no luck finding a replica of his famous chainsaw arm! I thought it'd be easy getting a replica from such a famous horror icon, but I was sorely mistake. Does anyone on here know where I could possibly get one? Many thanks!