Iam buying ds a nexus 7 for christmas. A relative is wanting to buy a gift card so that he can buy things to add to it on Christmas Day. Is this possible? Where do I buy one from if I can? I really haven't a clue about how to set this up. Admittedly I haven't looked at it properly but I have an iPad and that has always been so easy to register my card. However obv as for a child I do not wish to register my debit card against it for him!!