Options may include selling group data that doesn't identify any one person, or obtaining consent from customers before the sale goes ahead.
However Consumer New Zealand's recommending Dick Smith customers to unsubscribe from it's mailing list.
Chief executive Sue Chetwin says customers may be able to stop their information from being sold if they opt out of the mailing list before a sale goes through, if one does go ahead.
The Privacy Commission investigated the advert earlier today and has been assured by Ferrier Hodgson it will fully comply with it's obligations under the New Zealand and Australian Privacy Acts.