If you're looking for an affordable yet feature packed Wireless Follow Focus system then you may have seen the PDMovie Remote Air. Available in a few different packages, B&H currently has at least one of the PDMovie Wireless Follow Focus kits in stock, and here's an overview video via iKan Corp.
Different bundles are available for Single Channel (1 motor), Dual Channel (2 motors), and packages with Standard Motors and High Torque motors. Find out more details about the PDMovie Remote Air WFF at B&H (click here).
PD Movie Remote Air Wireless Follow Focus Systems