I might have some solenoids for sale in the net week or so, my uncle has a PhD in mechanical engineering and is helping to make sure it is safe in case something freezes and shatters and you have a can of propelent ripping the side of your jet pack out and flying everwhere around the room:rolleyes . Well...... that does sound like a cool effect but not safe. if there is enough time before halloween i might offer a few kits of this design but time will tell, I think a smoking jet pack will almot gaurantee you first place at a costume contest