Come on guys, never hurts to ask.
Meltalot...look for a plumber in the phone book, or a remodeling contractor. Call them and ask if they have or get lead pipe in the future from remodeling an old house...you would like the chance to buy the lead, or maybe pour some jigs for them. Find out what the going price is at the scrap yards in your area, and match that or add 10 cents and say you will pickup. Saves them the cost of paying an employee to take it to the scrap yard. Put add on craigslist in your area asking to buy and pick up the lead. There again, know the price of the scrap yards, offer a dime more a pound. It only means an extra buck for every 10 pounds, they make an extra buck, you get lead. I don't know how much effort you have put into it around your area like this, but I do it all the time, and ask people at work, Church, or even if I see a roofer/contractor at a minimart at the gas pumps, I will walk over and ask them. I've scored a lot of lead this way. People have it sitting around and are glad you get rid of the heavy "junk".
You may also want to drop your focus on 99.9% pure, not needed, and you narrow your window of opportunity. Hope this helps.