Having never heard of this i had a quick google.and seems there is nothing to be had here or in the USA (but as I say it was a quick google)
Its a shame, because I find this an intriguing plant and would like to try it myself. Possibly (as I read) its because it needs 8 months of strong sun, so isnt viable here. It would be nice to hear if anyone has tried growing it..possibly in a polytunnel or GH?