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?
Buy and use whole chickens instead of buying chicken pieces. They’re not difficult to break down yourself, a youtube tutorial is all you need.
Then keep the bones and stuff that would normally be considered waste. Put them into sturdy ziplock bags and freeze until you have a few of them. Then take them out and use them to make a chicken stock that can be the base of a soup or stew.