Try gas stations that still have mechanics and sell tires.They usually have a bucket of wheelweights laying around.Offer to buy it,they might give it to you or sell it cheap.In my work I get around to a lot of differant business and I found out if you want something,be nice, offer to pay and they just might give it to you.I went to a business once,that had two 55gal. drums of wheelweights,The man there gave me a 5gal. bucket full because I told him I made bullets.He said he had guns and liked to shoot.