Cut sponges in half
This is kind of a duh tip, but it took me so long to think of that perhaps you haven't tried it either.
I love green Scotch-Brite scratchy sponges for scouring in the kitchen, but I noticed that the middle was always wearing out before the edges. Or the whole thing would get impossibly smelly and clogged with scrambled eggs before it wore out and I'd have to throw it away.
I started cutting the sponges in half. They wear more evenly; it's not as big a deal if I have to throw one away earlier; and best of all, I get twice as many. I really do get as much wear out of each half sponge as I was getting from a whole one. Now a package lasts me twice as long!