JatuJak weekend market is a great place to find interesting and unusual things. Above is a horse made of wood, sold in the furniture section of the outer market. Below is an iron horse sold as art in the art section. I bet I can find a plastic horse too, but with 5000+ stalls in the weekend market, it may take a while.
On the following map, B is the wooden horse among the furniture, A is the iron horse among the art section.