Plumbing supply , metal recycle yards , some dry wall has lead in it check when hospitals or dr's offices get remodeled , When water mains get replaced often they are lead pipe or caulk joints , a 4 inch joint is around 4 lbs of lead on a sewer line and more on a water main. Then there are junk yards for building supplies , some old window weights are lead but not all be sure before you buy. Never tried battries but have wonered if they would yeild good lead ?