IF you don't mind your sinkers being a little hard you can make friends with a tire shop and buy some used wheel weights at scrap price. Be aware that those often have a little zink in the alloy and need a little hotter melting and pour temp.
If you want soft lead you can often find it in old sail boat keels. IF you live near a large enough lake the boatyards often have old boats that have been abandoned. You may have to do some work in hauling it off and scrapping it but it saves the boat
yard from having to pay to have it disposed of. Just make sure the boat has lead ballast. Some of the old race boats had iron ballasted keels.
They still use it in car batteries but in my opinion that is way to much hassle to mess with.
The bullet casters are usually on the hunt for it so the chance of getting it free will be very unlikely. You
should be able to find sources to buy "used" lead at scrap prices. Check your
local scrap or recycling yard.
