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.
Monitor mounting arms that connect to the back of the desk. I have 3 times as much room on my desk now. It’s amazing how much room monitor stands really take up. It’s not just the actual stand but really the surrounding area because you can’t really set any large objects in the vicinity. It really is a game changer to gain a lot of desk space.