Ebay is about the best source, although Amazon has the approximate same price when you figure shipping. Either way, seems you're looking at about $65. It is a chunk of change. Seems they never show up used.
I buy lead from all kinds of sources, so it's been a good thing for me to have. I can now buy cheap "no name" lead offa Ebay, and instantly know what I have when it arrives. Tweak it a bit, if needed.