Conductive bump formed on a surface of electrode terminal of an electronic component. To enable this cooperation, a clerk in each store proposes, to a customer in the store, coordinated commodities in which a commodity for sale in the original store is combined with a commodity for sale in another store. The unit main body includes a pair of sliders slidably disposed inside a case, lock members movably supported on the respective sliders, coupling parts provided on the case for engaging the lock members, and an urging device provided between the sliders for accumulating a force when the sliders slide away from the other.