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?
Probably doesn’t apply to >90% of people here, but if you ever get to build your own house, build it so the longer side faces south, and the shorter side west (in the northern hemisphere). Then you get more midday sun in the winter when the sun is further south, and less evening sun in the summer.