Free: Contests & Raffles.
Depending on how big the chunks you have are, you can get into pouring pretty easily and affordably. I use this to pour decoy j weights with a mold I bought on eBay for $20. I heat it on a simple propane camp stove and stir it with an old spoon. https://www.amazon.com/RCBS-80010-Lead-Pot/dp/B004XZGUSE/ref=pd_sbs_200_t_2/143-7386705-9941536?_encoding=UTF8&pd_rd_i=B004XZGUSE&pd_rd_r=4bb36eb3-eee1-4d6d-bc0b-bd60eeb0d563&pd_rd_w=XTeGJ&pd_rd_wg=0ZXA9&pf_rd_p=5cfcfe89-300f-47d2-b1ad-a4e27203a02a&pf_rd_r=YN9GQQ0HFPW4NJ33C1HW&psc=1&refRID=YN9GQQ0HFPW4NJ33C1HW