Maybe some empty brass bullet casings from your local gun shop, or incorporate some natural vegetation. Antlers are always the best but can be hard to come by sometimes.
If you have a sporting goods/ hunting store near by call them. They could help you locate them I would think. I have also seem faux ones in deorating stores - i.e. home goods
You would be surprised what you can find on CraigsList... There is a Wanted Section. What about going to a pawn shop and purchasing a bow or other hunting equiptment....