Check out this cool DIY you can make some cheap high voltage. I’ve always wanted to do this at a low cost but here it is!
What you see here is a spent propane torch tank with a 1-inch (2.5cm) ball bearing glued to it with a 1/4-inch (6mm) bearing glued to that. I stripped the propane tank with paint stripper, but this is unnecessary as you can just scrape off the paint where the ball bearings go. The Leyden jar is just a common quart sized polyethylene bottle cut off at the top. The electrode is an ordinary empty soda can turned upside down, stuffed into a styrofoam coffee cup. The coffee cup just acts as a gasket to hold the can in place. A piece of wire hanging from the soda can tab connects to about three inches of salt water in the bottom of the bottle through a hole in the styrofoam cup. Both the propane tank and the Leyden jar sit atop a strip of aluminum foil. That’s it.