Particularly good timing. Often places in various cities will have "back to school supplies" drives to benefit disadvantaged kids. I actually heard Staples doing that on the radio yesterday. Now, presumably they want you to buy new from them to donate, but I can't imagine, used but usable binders being turned away.
I'm not sure about the last part if that was in jest or not.... but presumably they won't be issuing you a $1.50 receipt for the reduced value of 20 ten yo binders. Straight light depreciation or exponential?