Pellets. 
These pellets have a nice feel to them, heavy, slightly soft, just very satisfying to hold.  They are also a good inexpensive source for high purity bismuth metal (click Source link for details). 
Source: United Nuclear 
Contributor: United Nuclear 
Acquired: 11 April, 2003 
Price: $18/pound 
Size: 1" 
Purity: 99.99%
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