Disclosed herein is a display unit that is rugged, re-usable, and configured for quick (and tool-free) assembly. The display unit includes a foldable frame with a scannable display code. The foldable frame is also configured to support at least one shelf, and the at least one shelf has one or more item codes that are distinct and separate from the scannable display code. Each of the item codes respectively identifies one or more products to be placed on the shelf. In some embodiments, the foldable frame of the display unit is pre-adhered (e.g., a first side panel and a second side panel are adhered along respective vertical fold lines to a back panel) and desired shelf heights for the display unit are pre-configured before shipment of the display unit to a merchant. In this way, the display unit can be quickly constructed by the merchant with the desired shelf heights.