Does anyone have a white Scotch Broom?

I just had a customer ask us for a white Scotch broom, Cytisus scoparium(could be praecox) 'St.Mary's White'or 'Minstead'. Has anyone seen this in the nursery trade for retail?
The catch is, the customer got it from a florist as a cut flower.
I know that some flowers are only available to the cut flower industry, so I want to be able to tell her yes or no if it's available.

Thanks.