Meet the Streetwise Sting Blade: a 22,000,000 knife stun gun that helps you defend yourself when in trouble. It comes with a stainless steel blade and bright LED flashlight with 3 modes. When you activate the device, it generates an electrical sound to make attackers think again. You can of course use it on them to incapacitate them.
The Sting Blade comes with built-in safety features. Costs under $30 at this time.