Share 'Large cigar boxes ?'

Anybody know where I can obtain some large cigar boxes? All I seem to be able to get are around 9" x 6" x 2". I'm looking for something a bit larger, say around 18" long x 9" wide but they seem to elude me. When I search the net about CBG's I see all these guys with nice big boxes in the pictures, where are they getting them from?