Mags we are working on. As far as units, weapons, and armor... Those are the issue. I'm not sure if we've been unlucky, but we have been getting next to nothing out of any boxes or enemies. This in turns leads to less money, money which we end up spending on raising our mag because we can't afford anything else.
I had 11 open inventory slots going into Forest, and ended up walking out of Dragon with an 1 open item slot. Those items barely covered the cost of the food for my mag.
Maybe I'm just not used to the Online difficulty, compared to the offline GCN difficulty. Maybe the accelerated leveling has skewed my view a little. *shrug*