American Express has released a new offer giving $5 back with a $25 or more purchase at participating restaurants during NYC Restaurant Week. During restaurant week, 3 course meals cost $25 for lunch and $38 for dinner.
Since this deal works for any type of spending (online excluded) at participating restaurants through 3/6/15, you should still receive the credit when purchasing gift cards. This amounts to a 20% discount if you buy gift cards in $25 increments.
All American Express cards are eligible for this promotion with the exception of corporate cards and prepaid products (excluding Serve).
You can find the full terms and register for the promotion here. Alternatively, you can register your linked card by tweeting #AmexNYCRW.