Talk to multiple roofers. They come across soft sheet lead on their roofing jobs ( from around the chimney). They will throw it out with the shingles. MAYBE they will set it aside for you. Make it easy on them. Maybe a 12 pack of their favorite beer will help develop the relationship.
Dentists X-Ray lead used to be a source, but most use digital xrays now. Find long-practicing dentists. They may have a bucket of old lead from years of being in practice. They have to pay hazmat fees to have it picked up. A bottle of wine could help. As him/her if he has other dentist friends who may have a stash hidden away. I am on a lead pick up list from multiple dentists in the area. Some have called to ask me to take it away. You need a lot of X-Ray films to yield some decent mass of lead. Most I got was ~8-10 lbs. Has been skim pickings the last 10 years (digital xrays).
