I got lucky last week. A carpenter friend was on a st. louis rehab and he brought me free about 25 eighteen inch long pieces of 1-1/2" lead pipe each with a wiped joint on the end!
I cut up and smelted the lead getting about 100#, then separately smelted the wiped joints I cut off, getting about 30# of what is probably 30-40% tin, considering wiping lead is typically 40-50% to begin with.
I put the word out several years ago with friends in the construction industry, and someone is always bringing me something, even if just an old bag of trot-line sinkers or weights off a diver's belt!
Circa 1964: Rocky to Bullwinkle:
"But that trick never works!"
But Bullwinkle tries it anyway...again and again