Keikoyari (training spears) are not obtained easily even in Japan. The author saw a kamayari for sale in a budō equipment shop in Tōkyō just once. And there is only one maker/distributor of wooden weapons who sells kamayari and suyari through his webshop. Recently he ships the spears to destinations outside Japan as well, but they are quite expensive.
Below you find the most common terms and descriptions for the parts of a Japanese spear.