More ideas from Robert

Preppers: Mousetrap (Sentry) or Perimeter Alarm. Costs $1.20 & 5 min to make with nails, a trap, and a hot glue gun. For safety sake, remove the shot & powder from the shotgun shell (if you reload it's even simpler) The primer alone is plenty loud -

Windmill Delta Stormproof Lighter ... withstands 70-80 mph winds, burns at 2000°F, waterproof case. $55