Interlocking modular display system for stored-value cards

A modular product display system, comprising:

• a) a first display panel having an upper panel portion and a lower panel portion foldably connected along an upper horizontal fold line;
• b) an upper engagement tab foldably connected at a top edge of the upper panel portion;
• c) a lower engagement tab formed within the upper panel portion and foldably connected to the lower panel portion along the upper horizontal fold line;
• d) a forwardly extending shelf structure foldably connected to the lower panel portion along a lower horizontal fold line for displaying products;
• and
• e) an engagement slot formed along the lower horizontal fold line for receiving the upper engagement tab of a second display panel when the upper engagement portion of the second display panel is folded into a horizontal position relative to the upper panel portion thereof or the lower engagement tab of the second display panel when the upper panel portion of the second display panel is folded into a vertical position relative to the lower panel portion thereof and the lower engagement tab of the second display panel is folded into a horizontal portion relative to the lower panel portion thereof.