Oftentimes he puts the cork in the comments section of his youtube videos. I know they're available at his sister site, forgeplanet (dot) com, but those are overpriced. There are chemical supply centers that sell them, as well. I'd jus research 2.5" cork, or whatever, on eBay.
I buy my cork from staples. It is nice a thin, and comes in rolls. It is also not too expensive
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