I first waited some months, for accessions to be available. At that time, I was told that CIP would send the material to me, basically putting import costs on my tab. When they found out I was in the US, I was told there were restrictions on Andean root and tuber crops (ARTC's), probably due to concerns about biopiracy.
I was of the understanding that patents don't work, in such a way that you could preempt the traditional use of plant life (which, in this particular case, was falling out of vogue.) You either have to develop a unique variety, documenting all your efforts, or you have to find a novel use for the plant material.
I have found and planted yacon, oca, mashua, and potato landraces. I would now be interested in the arrachachas and ullucos.
When we were just married, my wife tried to bring in olluco (same as ulluco). The customs agent at MIA started to tell her very indignantly that you can't bring in papas (potatoes). To which she replied, "no son papas....son ollucos!" That didn't help and they got thrown away anyway We still laugh about it!