It's some trouble, but a quick filing in your local small claims court for the $700 would be an interesting way to get your money back and see how it plays out.
Meta-idea: create a startup that functions as a marketplace for bringing together ideas for class action lawsuits and law firms.
Not quite the same thing as what you mentioned, but by creating financing that evaluates cases by their potential for a payoff, this should seed the kind of marketplace you mentioned.
* going down the wrong back and having to do a U-turn
* spending the physical time and labor to organize, and to go to court (just this might be over 700$ of time for some people)