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?
I also open up my eastern/southern facing drapes/blinds in the morning to allow the sun to heat up the house through the windows for some free heat throughout the day.
Removing the window screens in the winter helps a lot too.