Heads up, deal hunters! Office Depot/OfficeMax is running a promotion where you can snag $15 off when you buy $300 worth of Mastercard gift cards. This deal is back from December 14th to December 20th, so don't wait too long. It's only valid in-store, and there's a limit of one per household/business. Why should you care? Well, this is a great way to manufacture spend and rack up those valuable credit card rewards! You can buy multiple gift cards to hit the $300 threshold. Remember that the fee on each $200 Mastercard is $7.95. To maximize your return, use a credit card that earns bonus points at office supply stores. Even better, check your Amex Business Gold card for a potential $20 credit or your Chase Offers for 10% back. Dosh offers 2% back but excludes gift cards in the fine print. These deals pop up pretty frequently, so it's worth keeping an eye out if you missed it this time. The Doctor of Credit article has a history of when the deal has been available in the past!