I have three Pacific Scientific Servo drives and matching ball screw actuators on ebay right now. I have been planning to do a CNC conversion of a knee mill using this drives and motors, however just haven't found time to do it.
Here are the servo Drives:
Pacific Scientific Brushless Servo Drive PC833 001 T Encoder or Resolver | eBay
Here are the linear Actuators:
Thomson Linear Actuator with 700 Watt Pacific Scientific Servo Motor | eBay
Thomson Linear Actuator with 700 Watt Pacific Scientific Servo Motor | eBay
Thomson Linear Actuator with 700 Watt Pacific Scientific Servo Motor | eBay
Let me know if you have any questions.