Yup, Trido, they are overpriced over here too, although the species that is commercially harvested is different, I think its called Janus Lilandi (sp). They are predominately from the Western Cape and Atlantic seaboard- colsd water with big Great Whites in it! There is no commercial exploitation of the natal crayfish allowed.
I will have to wait anyway to stock it, as the season opens in March, not much of a problem, I am having issues with my reef tank and have managed little to no progress on the new system for a while, other than getting the stand back and most of the plumbing fittings in hand. Some pics will follow when I remember to take them.