I guess my price in lot of 50 was about $0.50 each from BelRay.  Not too bad for something that works; when oil drips get splayed all over underside of engine, it's a bummer, lots of effort for cleanup.  Anyway, internet purchase was way easier than driving all around town to find a solution.

The overall cost when considering cost of Oil, cost of Oil filter, my time and hassle....the price of the crush washer is almost invisible.
(ALSO:  I am immensely pleased and satisfied with your invention....the aluminum bracket that allows a SOLID TDI starter motor to connect with a Vanagon/Subie 2.2.  Very well done my man!  I drove all the way from St. Louis to San Diego, parking a little downhill each night at campsite so I could bumpstart the motor the next morning....ugh...that was not a happy time for me.  All fixed with your excellent bracket and the TDI starter motor.)
Not sure of Aluminum vs. Copper.  Both seem OK.  Soft metals....allow sealing.  For me, the hollow copper worked....the solid copper didn't.
Rich
San Diego

    On Saturday, August 31, 2019, 4:09:32 PM PDT, Karl Mullendore <tdiguru@WESTYVENTURES.COM> wrote:  
 
 That's a lot of $ for a crush washer. I pay 13 cents US from my parts supplier. FWIW, back when I was still doing customer service the proper gasket was aluminium, has that changed?