Cheap and simple: surge protectors. Accidents happen, and a power surge can kill a lot of equipment, better to keep it safe.
I recently had a situation where one killed my stove, dishwasher, smart lights, kitchen lights, rgb controllers, and subwoofer. Our computers have surge protectors, fortunately.
My landlord replaced the damaged items. But they could've been saved with 20$ worth of surge protectors.
On that note: I gotta buy more!
Creative speakers. I bought 2 speakers and a subwoofer in 2004, still using it.
I had a sony sub from 1996, it just recently died when the landlord messed up installing a power meter and killed a bunch of things in my apartment.
A decent safety razor, its cheap and should last you forever. Blades are significantly less expensive too.
A cheap electric one will last you a decade or more, and is 15$. At 10 cents per safety blade, you'll start saving after about 150 replacements.
Discuss how to save money.