I make them. I buy brass sheet, cut into smaller pieces, drill a hole through them, slide them over the spike in between the inlace and antler sections, then grind, sand, and polish into shape and finish I need.
This stuff is a lot of work, especially considering the tools I am having to use, but I have some interest in the purchase of some of them at a price I can live with on my end, so it's worth it since I enjoy making them.