Trickers is supposed to have Blue Gigantea. I bought it one time, and it did not survive. I have some of the aussies. But I have traded for them or someone has gave me seeds. I grow some of them from seed, but it is difficult because I live in zone 6 . I traded for N. violacea this spring. Andrew Davis might have some you can ask him. I have several tubers of N. albert de lastang. But I will not know what is still alive till later in the year when tubers sprout.