I am a creature of habit--I almost always dl from the archive or from amplificathon on LJ or DW, and I think most of those podfics go into the archive eventually? If it wasn't in the archive I guess I'd google for it, or search the podfic comms I frequent to find it again? I can't remember the archive ever failing me on this, though sometimes the comment link opens up an email instead of a webpage, and I have a block about cold-emailing strangers so sometimes those are the podfics I flake out on feedbacking (yes, I feel terrible about this!).