Saw this old thread and it got me thinking of something I do to save.
Our supermarket had a sale on their store brand plastic wrap. Since I often want just a small piece to wrap up something, I discovered a long time ago that it is possible to cut a new roll in half and have two rolls in the box. It helps to have another slightly smaller cardboard tube to slip inside the two divided pieces. You take a very sharp knife (careful!) and after drawing a Sharpie-line around the roll at the half-way mark, saw away until the roll is cut. It's not hard to do, and now you have two rolls. I put a rubber band around one, put the extra tube inside the two, put them back in the box (don't forget to punch in those little flaps at each end to hold the roll) and they're ready for use, one roll at a time.
I also do the same with my paper towels since I often need only a small piece. Be sure to save some cardboard tubes so you have one that fits to put inside the split tube.