Standard casting metal is the cheap alternative to model metal, and like model metal this is a tin/lead alloy but uses antimony as a flow improver. Use this for less detailed castings, and with practice it is possible to achieve results comparible with Model Metal. It can be melted on any domestic cooker.
3 x 125g sticks. Melting point 210C (410F)
65% Lead / 2% Antimony / 33% Tin