Low cost defense
I have a friend who is a receptionist in a church in a high risk area who was concerned about someone coming into the office on Monday to rob them when they were counting the collection. She asked the local police department about using pepper spray and they recommended to her that she get a can of wasp spray instead. The wasp spray, they told her, can shoot up to twenty feet away and is a lot more accurate, while with the pepper spray they have to get too close to you and could overpower you. The wasp spray temporarily blinds an attacker until they get to the hospital for an antidote. She keeps a can on her desk in the office and it doesn't attract attention from people like a can of pepper spray would. She also keeps one nearby at home for home protection. Thought this was interesting and might be of use...
And it does kill bugs