Hey fellows: Many thanks for all the great ideas so far. This is one of the great benefits of a forum like this. In the meantime, I did a bit of research and found that babbitt metal is a good source of tin also. Often heavy industry uses babbitt for casting bearings and saw guides....while digging through my stash, I happily found an old ingot of babbitt that was given to me years ago...don't you just love these treasure hunts? Thanks again...much appreciated...
Babbitt is still used by some industries but not nearly as much as it used to be and it is also different from in makeup from what it used to be. The automotive industry still uses it for crankshaft bearings as precast and machined shells. You might be able to source it at a facility that rebuilds engines.