Where you absolutely refuse to go the cheap way.
For me its deodorant. Everything else I’ve found but my chosen brand fails me.
Helmets
Office chairs are important, but people tend to overlook the rest of their office ergonomics. If you work at a computer you should spend money on an adjustable keyboard tray and monitor arms. Then buy a good ergonomic keyboard and vertical mouse or trackball to go with them. My back and wrists used to get sore by the end of the day. That hasn’t happened since I upgraded my gear.
PC power supply.
Never, ever skimp on a power supply. Get one from a reputable brand and with a rating above what you may actually need.
A failed PSU can in principle wreak havoc on any other components in the system, many of which are far more expensive than the PSU itself.
Laptops that are designed to support Linux
I totally get why you might not but for me, quality underwear has been a great purchase. They last longer, breath better, stay put, and synthetic ones are washable in a sink in a pinch when traveling(I mean they all are but these dry really quick)
