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You can make your own...

Here's the real deal. Think of it as a large water pistol. A water nozzle on a swivel (kind of like a lawn sprinkler, only bigger.)

Mount this on your jeep or pickup truck. You need a pressure tank (connected to the truck) that holds water that can be pressurized with a co2 cylinder (with a regulator).

You might want to add a small amount of polyethylene oxide (1) to the water to keep it from forming into droplets. This chemical also makes the water slightly more conductive.
( (1) you can put almost anything in the water just to make it conductive... dirt, salt, baking soda, vinegar etc.)

One side of a large neon transformer goes to the chassis of the truck through a large value resistor (to keep from killing people). You can shoot some varmits to check the "stun" level.

The other side of the transformer goes to a chain that is isolated from the truck and the other end dangles on the ground.

You can stand in the back of the pickup and aim your electric water cannon without getting shocked, or you can aim it remotely from the cab with servos.

There you have it, make sure you don't lean against the truck when it's turned on! Less than $100 if you can get the neon transformer used. (of course you need a ac inverter from radio shack to run the transformer)