Go for lava nuggets. You get ridiculous amounts from agnaktor. You don't need them for many armors and weapons, so you can turn most of them into resources. They give more than luddy, and agna is pretty easy if you're high rank. I got 16 nuggets from him once.
And do some high-rank freehunting in moga when it's abundant commodities. The high-rank monsters give a decent amount of resources, and you can get some rare commodities.