Do you have a heavy equipment / powertrain dealership near you? We rebuild axles at work, and they just throw the copper and brass washers/bushings in the regular bin. One of our small mining gear axle yields, on average has 6 - 10 lbs of copper washers, 20+ lbs of brass. A monthly dumpster dive, with permission, or even asking to have a scrap bin set up might work. (most valve cartridges, like pressure reducing valves or counter balance valves are aluminium or brass as well.)
On another note, car radiators, heater cores, coolers - love them! I just scrapped a 300 lbs rad from a stationary gen set, got $400 CAD for it.
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