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 have small ear canals and can't use most ear plugs and ear buds because they just push out of my ears, and if they do manage to stay I can feel it constantly pushing outwards on my ear and it starts to hurt pretty quickly. No one else in my house has this problem. I would absolutely say ear canals are different enough that there cannot be a catch-all solution so they just have to go with average range. I'm sure if I got custom plugs it would be different, but anything off the shelf is not going to work for my baby ears.