By providing a unique, preprinted housing member which automatically expands from a flat, generally two-dimensional configuration into a three-dimensional promotional display, and is securely maintained in the three-dimensional configuration for any desired time duration, a unique, hands-on, printed, long-lasting visually exciting and interest-generating advertising/promotional product is obtained. In the present invention, the self-erecting, promotional display member incorporates small magnetic members mounted to internal panels, struts or support walls of the display member, with the magnetic members being positions for being automatically activated simultaneously with the movement of the display member from its two-dimensional configuration into its three-dimensional configuration. Once activated, the magnetic members are brought into locked engagement with each other, securely holding the display member in its fully erect, three-dimensional display configuration.