Hi, Leo. I'm going to check out Silverhill's for the I. holubii and I. bolusii and the African Merremia species. I checked out the Desert Botanical Garden site to see if they had any seeds for sale like the M. aurea but they don't have any seeds for sale. It would also be a good one to get seeds for since it makes a tuber. Thanks for the info again. :) Donna Anderson Winnipeg, Manitoba Canada