Caesar, I am very interested in growing Dioscorea bulbifera. Started growing D. polystachia last year from some areal bulbs a friend gave me. After reading eric toensmeir's book I am extremely excited about the size of the arial bulbs of D. bulbifera! I encountered the same problem you did trying to find a reputable supplier online for a non toxic cultivated variety. I would be extremely grateful if you would be willing to share some of your edible varieties and happy to pay for your trouble.