No but seriously if there is more about the only 2 ppl I can think of is snapperhead and allen lowrie if them 2 men don't have it no one probably does. But I haven't seen snapperhead post anywhere in 2 years.
You might have some success with Best Carnivorous Plants, based in the Czech Republic. They don't have Cephalotus plants for sale on their website but have a variety of seeds -- not quite mature plants, I understand, but I mention it because it might mean that they have mature plants available but not listed for sale. They do state that they have an exclusive stock list ("special collection") for people interested in trading or helping them with the website (see here), so it might be worth emailing them and enquiring.