You should try areas where middle or lower income people live. They would rather recycle locks or other goods. Second hand stores or flea markets. I bought some good locks, some in the original wrapping, for a lot less than what we'd pay for them at the suppliers. And the price was negotiable, too
Also some good second hand tools eg. screwdrivers, hammers,rachet sets etc. I would stay clear from buying electricle goods for obvious reasons.