Marvin Display is your complete source for retail store fixtures and items to display your product such as wall systems, showcases, store supplies, racks and mannequins, as well as, a full service flag store for flags, banners, flagpoles, & custom flags. Marvin Display is your complete source for retail store fixtures and items to display your product such as wall systems, showcases, store supplies, racks and mannequins, as well as, a full service flag store for flags, banners, flagpoles, & custom flags.