Here’s a couple examples from my life:
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Safety Razor. I get a better shave and it’s like $15 for 100 razor blades, which lasts me a couple years. Way way way better than the disposable multi-blade Gillette things, which sell 5 heads for $20.
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Handkerchiefs. I am prone to allergies, so instead of constantly buying disposable tissues, we now have a stack of handkerchiefs that can just be used a few times and then thrown in the wash. This has also saved me loads.
What about you?
Add to that, onion butts, potato peels, corn cobs, tough mushroom stems, etc. All great for stock.