How should I address my lower quarter rust on a budget?

I'm in "preventative body work" mode on my duster- I don't have the time and money for proper bodywork+repaint right now so I'm trying to prevent existing problems from getting worse and make the car look as good as I can while doing so.

I want to do something about my rusty quarter panels. Is there a cheap quarter skin that available that will do the job adequately or should I resort to bondo until I can afford better replacement panels (probably at least a year away before I get to that point).