Guns. The one my father bought me for my 10th birthday still works perfectly. Though, I lost interest in skeet shooting really fast when I had to pay for my own ammunition and clay targets.
Pens. They just come into my life as small gifts/promotional items from companies. I get pens for free more frequently than I run out of ink in them. The one time I have to buy a pen, I will get ripped off because I have no idea how much they cost.
Insecticide. I control ants using borax, flies using vinegar, and roaches by occasionally asking them nicely to leave. I do not kill spiders. As for controlling the insects that want to eat the plants around my house, the spiders, wasps and other natural predators do a fine job of that, as long as you don't murder them.