Answer: Schlumbergera bridgesii is the Christmas cactus. It is sometimes confused with Zygocactus truncactus, which produces much longer leaves than Schlumbergera. It's possible to purchase seeds of both Schlumbergera and Zygocactus, but I can't find any live plants. Try contacting the Cactus Mall (http://www.cactus-mall.com), or Cyberseeds (http://www.cyberseeds.com).
Good luck in your search!
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