I had a bunch of extra tools that didn't fit into my normal tool cabinets. Looking for something in 2 soft tools bags full of pliers and hammers was a pain.
I still wanted them accessible, but didn't need to spend $200 on another steel box. I had ALOT of PVC pipe and gutter down spout let over scraps. I cut them down to 6" and hot glued them like a honeycomb into a thick stiff plastic flip lid box, about 12" deep. I leave the lid open and pull it off a shelf when I need a tool.
There's probably 30 ft of scrap pipe in there. Cost? Some glue sticks I guess....