The closest plant generally available is P. 'African Oddity'. It's very close and a fraction of the difficulty in growing.

P. quadridichotomum is not as difficult to grow as many have posted. This species likes to be dried every once in a while. They loathe sitting in wet, stagnant media.
The best cultivation for this species is to wet it and allow it to dry out, nearly completely. Give it a mild fertilizer every few weeks as this species is a hungry plant.

Growing this species one must have an area where good air movement and sunlight is abundant. This species doe not like it wet for long periods of time.
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This clone has a tendency to make pups but not get too large in size.
Other clones get as big as a superbum and make few pups.
I have seen various clones out there.