Do you have an outdoor range close to you? If you do, talk to the owner/range master to see if you can try this:
get a 4x4 remote control vehicle, modify it with a wooden dowel to hold a balloon (100mph tape works good for this). Tape/Tie a balloon to the dowel, have a buddy drive the car. Cheap man's moving target
Change it up a bit, use two balloons, different colors (1 good guy 1 bad guy)
Use helium balloons, and don't use the dowel, use string really changes the dynamic)
Heck just be creative, improvise adapt and overcome