Unfortunately they are not available. The problem is that US and Canada Plant Health authorities will not allow any plant material of potato to be sent to US or Canada from other countries. This is because the plant may carry pests or diseases that are not present in North America.
The only way to have our potatoes legitimately on sale there is to have tissue cultures sent to a government plant quarantine lab where they do tests to confirm the purity of the culture. This takes up to two years and is expensive.
If found to be safe, the variety can be released to a seed grower who would multiply the stock on the farm. This would take another five years before stocks were large enough to sell.
This is something we are working on but it will take time!!