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.
Small adhesive rubber bumpers or “feet” that came in a variety of sizes to put on the bottom of things. Was under $5 but has brought me some joy going around my home putting feet on anything that isn’t level or could scratch or makes noise. Something oddly satisfying about it.
I did this too, everything had feet by the time I finished. Everything.