just a plastic case with a spring in it
Well, the simplest ideas are often the best, but still I hope you're exaggerating just a little

i just know that i'm gonna end up cleaning glass with a bush or obstacle or somethinggggggggg that i'm gonna hit it with
We obviously prefer it if you look after it, and of course it'll last longer if you do, but they are designed to be robust!
If that's not enough, check out the site today (possibly tomorrow too) to see the current price.
Paul