I signed up for the FAA commercial UAV test and bought the prep test for $25. Here's a bit of interesting info, the lady in charge at the testing center told me that of the folks so far who have tested, 40% have failed (and yes, you have to wait two weeks and pay the $150 - again). However, those who got the prep test and studied have all passed. I'll take it in October. And, our AMA Chapter participated in Aviation Day last month, it was great fun, here's a video of it: