Homebrew PCBs

I do not have any sources of tin, but I suspect a web search would 
turn up some.

I do want to make you aware that there are sources for a tin plating 
solution that only requires that you dip the copper clad board in it 
for a few minutes at room temperature.

http://www.vetco.net/catalog/product_info.php?products_id=936&gclid=CNPC5-rNq7wCFeZj7AodPA8ALg

There are other sources and a web search will turn up many. I have 
used such solutions and they work quite well with no fuss.

Paul A.