I've had great luck walking in to computer shops with donuts and a price sheet on top. I have several thrift stores that I pick up at. goodwill outlets. and fab shops that have been great customers for years. but each requires a different approach and it is all customer service selling yourself as a benefit to their business.
govt auctions. I recently bought a lot from the USDA that was located out in the middle of nowhere. the scrap value was about 5 times what I paid for the lot. the only downside is the hoops to jump through to get set up.
state surplus, auctions and cash sales
military surplus
storage auctions. don't waste your time bidding on the whole units unless you see enough scrap to make it worth wile, instead buy the scrap from the person who bought the unit. or offer to haul it off for free.
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