Vertically stackable, laterally extendable merchandise display system

A modular product display system, comprising:

• at least a first module comprising at least two vertically stacked layers, each layer comprising at least one roller track supported on one longitudinal end by a rail such that the one longitudinal end is at a different elevation than another longitudinal end of the at least one roller track
• at least a second module adjacent to and joined to the at least a first module, comprising at least two vertically stacked layers, each layer comprising at least one roller track supported on one longitudinal end by a rail such that the one longitudinal end is at a different elevation than another longitudinal end of the at least one roller track;
• wherein each of the at least a first module and the at least a second module comprises at least two vertical stacking side barriers disposed at laterally spaced apart positions between the at least one roller track in each of the at least two vertically stacked layers, the at least two vertical stacking side barriers having protrusions on an upper edge and a lower edge engageable with corresponding openings in the at least one roller track, wherein (i) the protrusions on at least one of the upper edge and the lower edge are displaced from a plane of the vertical stacked side barrier, or (ii) the protrusions on the vertical stacked side barriers between the at least two vertically stacked layers are laterally displaced from corresponding protrusions on corresponding vertical stacked side barriers between at least one further vertically stacked layers;
• and
• wherein the at least a first module and the at least a second module are joined by laterally spaced apart protrusions on at least one of the vertical stacking side barriers coupled to adjacent roller tracks in in the at least a first and the at least a second module.