I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
I was playing a lot of Skyrim and other games during the covid lockdown using a wireless xbox controller. I’d go to play a long session and the controller would die about 15 minutes in, which meant a 10 minute walk to the drug store to dump $10 on batteries or hope I had some left over from the last trip and I could find them. I eventually bought a set of six AAs and a wall charger for like $40. Whenever the batteries would die, I’d just swap them out for the ones that were already charged since it could charge 4 at a time, so I always had some ready.