Carbon steel unseasoned wok. I’ve used mine multiple times weekly for almost 20 years for stir frying and deep frying. Nothing fancy, just a Joyce Chen wok with some accessories that was $30 at Bed Bath Beyond (RIP). My mom has used hers for 50 years.
Oh, here’s another one. For people who do yard work, I’m a big fan of using a machete instead of a weed whacker machine. So much fun to let out your inner Star Wars Kid. I bought a cheapo $7 Walmart machete a few years ago and haven’t used the weed whacker since. And I expect the blade to last forever, unlike the string trimmers.