Good quality cabinets are expensive. That goes for both metal and wood. Even the plastic ones at Home Depot / Loews are pricey, but I don't know how well they'd hold up. You could check the catalog that Northern Tool puts out, but they aren't cheap either. Do you have anything like a restaurant supply warehouse, or an industrial supply warehouse that sells used items?? You probably could get some good sturdy shelving or bins that would stand up.