In another thread of mine, I have discussed and proven the foil wraps and caps on high end scotch, whisky and wine are pure Sn. Not a lot of it, but if you save up your own + ask a bunch of friends and relatives to save their foil tops, it adds up.
Well as the opening said, Tin is where you find it. I was in a local scrap yard last week and ran across some bars in the lead barrels. I threw them in with my other stuff and bought it all for $1 a pound. Those 6 foundry bars were stamped PURE TIN. And weighed 7.7 pounds total. So almost 8# of pure foundry bars of Sn for 6 bucks is a nice deal!
You just gotta keep your eyes open!