Can I purchase a net gun anywhere? (Because of a drone that's harrassing us)

Some people here who follow me on Facebook already know about this, but here are the basics.

Someone has been following and buzzing my niece and another neighbor girl with a drone. When I say “buzzing”, I mean they bring it down approximately four feet above their heads and follow them very closely. My niece, sister and myself took a walk to play Pokemon Go not too long ago and lo and behold, the drone was hovering above us in the sky. The last time it showed up, which was the 31st, the drone was hovering about 10 feet over a part of the house roof. I tried to get a picture, but they took off as soon as I pulled my phone out. They constantly come onto our property and it’s really, really starting to bother me – especially because of their actions toward the girls.

We called the police and the airport (because it’s within five miles of PDX and it’s illegal to fly a drone that close without approval first), and found out they’re breaking multiple laws. They’re not even supposed to fly over a group of people, let alone literally follow and harass underage kids. The police said we can do whatever we want to get it out of the sky when it’s on our property, but that’s the problem.

A friend sent me a link about how to build a net gun, but on closer inspection, I don’t trust myself to build it. So that’s what made me wonder if they sell them anywhere? Or if not that, if any Jellies have an idea of what else I might be able to do to actually get it down, please feel more than free to suggest stuff for me. It’s really creeping me out.