Office Depot and OfficeMax have an unadvertised promotion for MasterCard gift cards. This is the same deal we saw a few weeks ago with a discount of $15 when purchasing $300 or more in MasterCard gift cards.
To maximize the deal you can buy two $200 MasterCard gift cards and use a Chase Ink Plus/Cash card.
The same trick that worked last time seems to be working again. Enter your rewards number and you could see a second $15 discount.
The deal is available until August 25th, 2018.