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They list "5/15 Monotype" (5% Tin/15% Antimony/80% Lead) which would have a BHN of about 23, for between $5 and $7/lb depending on quantity purchased. It would be a very useful alloy for bullet casting and could be used as is, mixed with pure lead, or mixed with wheelweight to suit.
Around $1/lb should not be insulting to him as a starting point.