They charge more than $200 for a simple circuit. My issue is that it does not work to your agreed satisfaction and give it so late that you can do nothing about it. Or they may have sold it to another student and you only know when the Univ examiner rips you apart on that. And on rare occasions the prof is hand in glove with these guys.
I could go on with the list of misdeeds, but I think the point is clear. Neither my ethics nor yours will fit in this line.