For every $100  you spend on a gift voucher you get an extra $20 gift voucher for free:

When you purchase a $100 gift voucher for someone else, we will send you another $20 gift voucher for free. You can use this second voucher for yourself or give it to anyone you want to. The 2nd gift voucher will be delivered to your email address.
You must select the $100 gift voucher (or any of the higher amounts) below, in order to receive the 2nd voucher: