Veritas is always at the disposal of its instructors and especially its clients. Ask and you shall receive. And they pay amazingly well -- teaching a class with the SAT 2400 folks pays $40/hr. Great for part-time, hourly work.
Cons
With SAT Subject Test tutoring, the Instructors must often create their own content, which can be time-consuming (although you can get paid for those hours if you offer your lesson plans to the company).