An AMEX Offer for Best Buy appeared yesterday: spend $100 and get $10 back or 1,000 MR points, through 03/31. The offer terms specifically state that purchasing physical gift cards is allowed, but e-gift cards and Corporate gift cards do not qualify.
Not valid for e-gift card purchases. Excludes corporate gift card purchases. Not valid at outlet locations. Excludes Best Buy Express, Geek Squad services not purchased through Best Buy, Best Buy Parts Store, Best Buy Direct, Best Buy Education, Best Buy Ignite, Best Buy Secondary Markets, Best Buy Private Store & Auction, and standalone Pacific Sales stores. Offer is non-transferable. Limit of 1 statement credit per Card Member.
Below is a screenshot of the MR offer.
The author received this offer on both the primary card and authorized user card accounts, so it seems to be widely available. If you do not have anything to buy right now, you could consider stocking up on some physical BBY gift cards. Best Buy gift cards are highly useful, similar to Amazon gift cards. The number of offers is limited, so add it soon!