  Aluminum half cylinders.
The Boeing aircraft company operates a wonderful surplus store in Kent, Washington (near Seattle). I'd read about this place several times, but it was only because I was reminded by Troy McFarland literally days before traveling that I put two and two together: I'm flying to Seattle, and I could go to that surplus store.
It's got everything from old computers to old six ton machine tools, whatever all you might not need anymore for making airplanes. I bought several interesting shapes of aluminum, and some lovely tungsten carbide slot cutting bits from their toolroom section: Click the Source link below to see all the samples that come from this source.
Source: Boeing Surplus Store
Contributor: Theodore Gray
Acquired: 11 August, 2007
Text Updated: 11 August, 2007
Price: $10
Size: 6"
Purity: 95%
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