Ruling on discount cards
Question

                Some companies and hospitals issue discount cards. This is a card which is given to whoever wants one in return for a sum of money paid annually, and the carrier of the card can get some discounts or free examinations during the year. If after one year he has not used the card, he does not have the right to ask for the money that he paid to be returned.
Praise be to Allah.Shaykh Ibn Baaz (may Allaah have mercy on 
    him) was asked about the ruling on issuing these cards and dealing in them. 
He replied: 
This is not permissible, because it involves 
    ambiguity, gambling and a great deal of risk, so we should avoid it. And Allaah is the source of strength,