There’s quite a few different YouTube channels dedicated to finding scrap metal or even a guy who owns a scrap metal business who pays for scrap metal, processes it, then sells it to various foundries to be melted down into something new.
I personally like to buy used items and resell them on eBay. Sometimes at thrift stores, but also garage sales and estate auctions. You can find auctions nearby on a site called hibid. I also sell my old unused items on eBay as well or even parts from broken items. Just look up the item on eBay and filter by sold.
Doesn’t that bypass an electronic lock per the DMCA?