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Don't know any sources, but will be interested to hear if anyone does. Never seen any listed, but you might find a source.
Stock ones don't get re-cored by your normal run-o-the-mill radiator shops, and aftermarket ones neither. But someone's making the cores, so someone may be able to buy them.
Maybe 1-800-RADIATOR has a source. They're one of the (or the) biggest of the retail oriented suppliers.
But I'm guessing that it's so specialized, that nobody but the actual manufacturers bother. And even then, maybe they just recycle the aluminum and star fresh anyway?
Good luck.
Oh, and what happened to yours? What type/brand is it? The brand may be critical, so you might have the original manufacturer as your source.
Paul