Are you looking for a side gig to put a little extra cash in your pocket? Scrap metal may be something that you are interested in. If you know what to look for, where to look for it and where to take it; recycling can be a lucrative endeavor to do in your free time to make extra money. Junk cars can be parted out for their best scrap metal and the steel sold separately, or you may want to find more valuable metals in waste from building renovations.