Where you absolutely refuse to go the cheap way.
For me its deodorant. Everything else I’ve found but my chosen brand fails me.
Everything that is under you. Shoes, mattress, bike, car, desk chair etc.
Cheaping out on the above will cost you more in hospital and physical therapy bills.
Good comment! It’s a great rule of thumb.
I’ll add: a good bike helmet, which is a single-use item. One knock to the head and the helmet’s dead: if you are okay it’s done its job.
I wanted to buy new good shoes, but I can’t find good ones. 😫 to be fair though, my feet are weird sizes.