When I started on slingshots again as an adult, I was shooting cat eye marbles exclusively. They are quite cheap here, $1 gets me 100 of them. I then bought 10 and 12mm lead mould of Ebay, I recycle lead from old car batteries (yes, I know it is risky, dangerous , messy....) but it is the only reliable source I got.
Steel is expensive to buy and ship, but I discovered local car garages that demolish cv joints and discard steel balls, I once collected two 20lt bucket loads of mixed steel ball sizes.
I'm now searching for an 8mm fishing mould, that cast 10 balls or more at once. I have a Lee precision mould for 2 ball, but I can't use it because I don't have a melting pot with a "tap" to pour the led into it.
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