you could build a foundry...they have extremely hot ones that run off used motor/vegetable oil.
that is if you have some land to work around.
oh and you should check out auctions of industrial shit for lead ingots. they're most commonly used as forklift weights.
I put 500 pounds of weights into one of my tenants yacht's to balance it out and he had paid pretty much 1 dollar per pound for the lead ingots from a forklift supply place.
