The referred nursery has a list of plants which were available when they last updated it in the HMF database. It is what you view when you click on the Nursery Page for that nursery and view their list under the tab "Plants for Sale". On that list, Polar Bear appears on the third page of the four pages of varieties beginning with the letter "P". It may not be on the current plant list on their web site. Unfortunately, the listing nursery appears to have not maintained their list in the database. Other than that availability at that time, we have no information of it being available elsewhere at this time.