  Plumbing lead. 
I purchased several 10lb bars of plumbing lead from a hardware store probably in the early 1990s.  It's still available in this form so far as I know. 
I asked Jim Zimmerman to use a cold chisel to chop off a lump of one of the bars and pound it into a nice primitive-looking lump.  (Sawing it off would have generated poisonous lead dust.) 
Source: Hardware Store 
Contributor: Theodore Gray 
Acquired: 15 April, 2002 
Price: $1/pound 
Size: 2.5" 
Purity: >95%
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