Cheap ball bearings.
If you look around long enough, eventually you can find a cheap source of almost anything. It turns that in the case of ball bearings, the secret word is "slingshot ammunition". These may not be very high-precision, but they are many times cheaper than those sold for actual use in actual bearings.
Source: Cabelas
Contributor: Theodore Gray
Acquired: 26 September, 2003
Price: $15/400
Size: 3/8"
Purity: 99%
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