If you're planning a move to a new home, you know how expensive buying new cardboard shipping boxes can be. One alternative is to not only look for lightly used boxes, but to sell your boxes after you've moved. There are retailers across the United States that not only sell lightly used boxes at a fraction of the cost, but they'll buy back old boxes after you've unpacked. Spend less, make a little money back, and have a smaller impact on the environment. Smart move!