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Sorry, I destroy the plant any time I see it in my yard. It's a Class I (one) invasive species here in Florida, and therefore probably even illegal to propagate.
But if you go to the link in the post above and follow it to the page for this plant, it shows there are 11 people listed who have the plant for sale or trade.
Not sure why you would even want such a plant, but hey, whatever floats your boat.