ha...'just purchased one before i saw this thread. i need some time off so i'm going to tour the usa
there really is no catch from what i saw. i just figure they're hurting for passengers from sept 8th thru oct 8th because it's low season.
the operator on the phone requests a "TRUEBLUE" number before you can complete the transaction so be sure to sign up for the program prior to calling to purchase the pass.