This week, OfficeMax is offering $20 off when you purchase $300 in MasterCard gift cards (in-store only). Savings should be applied automatically at the register. Limit 2 discounts per customer. It is not limited to 2 gift cards, but to two $20 discounts. Best option: buy three $200 MasterCard gift cards for $40 off. Make sure to pay with a card that offers bonus points at office supply stores!