They have a lot more copper % going by weight than regular motors. As an added bonus they often also have some aluminum. Old style generators (what cars used before alternators) have the most copper, then alternators, then starters, then electric motors. Right now for me alternators are at $0.60, starters are $0.54, and motors are $0.33. Don't really see enough generators anymore to worry about getting a price on them all the time, I just get a price when I've got enough saved up to make a decent batch of them.
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