Having just spoken with an Amazon representative this morning, I was informed that this offer is only available to new and renewing individual subscribers only, and not available under any family plan. That's unfortunate for me, being on a family plan with my daughters phone attached to my plan with my BB 8100. Guess I'll have wait until a deal comes along that would accomodate my plan; I wonder why they wouldn't want to have a family plan associated with this deal, but I'm sure they have some marketing plan behind that answer.
Thanks to all who replied to me about this thread.