Part of the problem is that the same motor is being used for 21.5 classes at other tracks for spec classes other than the TCS.
there was stock of motors before TCS announced the motor rules, as soon as they were announced there was a run and they all sold out. At our track we use both the HobbyWing fixed timing and reedy fixed timing in our 21.5 TC class. Really not sure where else 21.5 TC fixed timing is being run.