Availability of Inca Food Crops

Dear Medit Plant folks,
I work at Cabrillo College in the horticulture department where we grow a wide variety of plants for our students to study and also to sell at our annual plant sale on Mother's Day Weekend. Last year close to 25% of our sales were food related ie., $18,000 of veggie starts and $7,000 of perennial edible crops such as fruit trees, citrus, strawberries, blueberries, etc. I recently downloaded the over 440 page document on the "Lost Crops of the Incas" off the internet. The variety of food crops they grew is amazing. We have Oca (Oxalis tuberosa) and Mashua (Tropaeolum tuberosum) growing in our nursery and are looking for sources of any other Inca food crops including but limited to Bolivian Sunroot also known as Yakon(Smallianthus sonchifolia syn. Polymnia soncifolia) and Achira (Canna edulis syn. Canna indica). Any leads on finding sources / starts for these plants would be greatly appreciated. I realize I can buy some of these crops via the internet for around $7 or more per plant but am looking for larger amounts at more reasonable prices so we can start growing several plants in our nursery. If you live in the Bay Area and have some extra to share or sell I could easily pick them up and/or divide/ dig them up under your supervision. 
Thank you for your help.
The rains are finally here!
Ernie Wasson
Nursery & Garden Curator
Cabrillo College
Aptos, CA
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