Second hand - not sure.

First hand - and in various quantity - contact a company that sells
solder.

Try Metals in the yellow pages - or web - lots of sources.

Al solder is Sn - but Tin Lead solder in various alloys is common.

Tin and lead are normally sold by the brick for industrial soldering.

Martin
--
Martin Eastburn, Barbara Eastburn
@ home at Lion's Lair with our computer
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder


That guy wrote:

Hello all, first posting.

I was hoping someone could help me find a source for tin. Not soft white
metal, or tinplated steel, but the actual element Tin represented by Sn.
I am amazed at how hard it seems to be to find the stuff, I am stumping
everyone I ask. I will be using it to make bronze, so I must be sure
it's the correct stuff.

Thanks in advance to anyone who can help.