I buy used tackleboxes, preferably full of gear, and a catfisherman's box might have several pounds of lead sinkers. One box I bought for cheap had a jar of maybe 400 splitshot sinkers of the kind I don't fish with, which will make about as many jighheads. Haven't tried the following (maybe someone can comment): car battery plates, and old lead plumbing pipe and fittings...and Chinese-made kiddie toys?