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You can get it from Peruvian torch, and San Pedro which are ornamental cacti. The cuttings are cheap and easy to obtain from your local garden center, or online (google: bouncing bear). <--(not a competitor of gc really, but if its against the rules, my bad. LMK)
I would avoid starting from seed as it will take a hell of a lot longer to get the desired size for ingestion.
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