what about making your own? its extreamly simple, i made a small one in my basement for airsoft when i was younger. About 10 meters long. Just buy 2 clothesline pulleys, coated steel cable, and a clip to attach the cardboard/paper to. You can add a few cable supports depending on how long you make it.
If your looking into electric ones, you add a small industrial garage door motor to the system, and a second pulley to one of the 2 axles. Get a belt to drive the cable in and out. And a 3 way switch (Forward, Off, Reverse) to control the motor. If I didn't have a fulltime job i'd offer to build them.
Honestly considering putting a wanted sign up at your range for a handyman to build you a cable return system. If youd like more information or help, let me know and I can draw up some working drawings.