Servostab,
Let's see some in-camera footage!
Have to say I'm doubtful about servo solutions. My experience is slops and backlashes produced by internal servo gears will never produce stabilization equal to that of brushless direct motors.
Anyone tried the FY30A for camera stabilization? It is only $130, but there seems to be very little info about it. Videos found on YT look promising but not conclusive.