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 left the brand out intentionally, but since you asked I got the Samsung Galaxy Tab. I think any tablet would work though. I only got this one because I already have a Samsung phone so I figured it’d be familiar enough, and the tablet was on a really good sale at the time. Once I’m done school and working full time I plan on upgrading to a Microsoft Surface.