While doing some googling today I rediscovered a site I had forgotten about. Actually 3 sites regionally divided. Boeing maintains surplus sales centers in several locations and sell many items that might have some interest for busnuts that live or travel near their sites.
QuoteRaw and formed metal, material such as aluminum, titanium, stainless steel, steel in sheet tube, plate and block are frequently in our yard.
QuoteHardware, drill bits, reamers, countersinks, cutters, rivet sets, air tools, and many other machine shop items are available.
QuoteShop Furniture: shop desks, stools, carts, storage cabinets, steel workbenches, tool boxes, fire cabinets, and many other items used in the shop areas are generally available in the store.
Kent, WA: Boeing Investment Recovery and Surplus Sales (http://www.boeing.com/assocproducts/surplus/retail/items.html)
Witchita, KS: Spirit Aerosystems Investment Recovery and Surplus Sales (http://surplussales.spiritaero.com/Items_for_Sale/Items_For_Sale.htm)
Southern CA (6 locations): Boeing Investment Recovery and Surplus Sales (http://www.boeing.com/assocproducts/surplus/so_cal/commodities.html)
Note: When looking at the metals, bulk scrap metals require bidding and reclamation licenses. However each location also references selling sheet metals, tubing, etc. in their surplus store.