When LPs were the primary medium for the commercial distribution of sound recordings, manufacturers would cut the corner, punch a hole, or add a notch to the spine of the jacket of unsold records returned from retailers; these "cut-outs" might then be re-sold to record retailers or other sales outlets for sale at a discounted price. 45 RPM singles records were usually drilled with a hole through the label, or stamped "C.O.". A special section of a record store devoted to such items was known as the cut-out bin or bargain bin.