Office Depot/OfficeMax are reportedly offering a $10 instant discount when buying $100 or more of Mastercard gift cards in-store.
The Deal
Buy $100+ Mastercard gift...
Update 6/20/20: Extended to June 24, 2020.
Update 6/13/20: Thanks again to Jeph36 for advising that this has been extended to June 20. It's interesting...