This strategy will do more to stimulate the economy than provide for your well being.

Buy good stuff, learn to use it and maintain it. When the crunch comes, you will be relying on a tool you know well and can use effectively.

In the normal course of events, you will upgrade and supplement a lot of your items - knives, flashlights, FAKs, etc. and you will obtain some useful redundancy. But you don't need to go bonkers....