Darrin, You might want to try Japanese Armor King.
http://www.japanesearmorking.com/jak3.htm
Be sure to email him, as he seems to have more items on hand than he posts on his site. Unfortuantly outside of that option there are only the figure kits, by Dragon, Finemolds or Tamiya. A friend of mine who collects IJA equipment was a bit suspect of the accuracy of the Allarmi Japanese figs I showed him. Hope this will help. Best regards, Travis