I usualy pickup useful looking bits and pieces at estate sales, garage sales, and the thrift store. often its the odd matched stainless flatware, tweezers, manicure tools and kitchen gadgets.
Often I will cut them up with a pair of tin snips or attack them with a file to improve the shape, or addapt them to my hand vice/exacto knife.
I think my most useful bit came out of the garage. An old wood rasp made some very nice fish scales.
As for finding heat sinks check with your local E-waste recycler. Usualy the CPU's are seperated from the mother board and scraped seperatly for the percious metals.
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