Hello! FYI I wrote that post when I was in Costa Rica. So when I said I have "Found cuttings here" I meant here in Costa Rica...
However, finally, I was able to come up with a couple tubers (sold for consumption), one grew one rotted. They were started in February. I've got it in a planter on the porch. What I have learned so far...They grow very slow when it is cold and pretty darn fast when warm (they do die in a freeze so they need a greenhouse or a way to overwinter), and snails absolutely love them (I ended up moving the planter from my yard to my balcony after snails ate more than half of the foliage in two days).
I know that they traditionally take a year til harvest, which is why they aren't grown in northern california since it is usually too cold for them in the winter. I have heard that in some places they have been trained to produce in 7-8 months. Mine is of the Costa Rica variety and most likely regular long season variety. I am praying I can keep this plant happy til in reproduces and I will then share with a few people to be sure it's legacy is kept going. I heard they make babies, I forgot what they are called, so might have some sooner than later.
But at least we know if you can find it in the store for consumption, to can use those to grow it. I have heard you can find them in Southern California Latino markets sometimes, even as far north as San Francisco.