Through September 14, Walgreens is offering six free 5×7 photo cards via code FREECARDS, which is a $21 value! You'll need to use your mobile phone, as this deal is only valid via their app.
Once downloading the free app, head to the Photos section and select “Two-Sided Cards.” Then design any type of card shown for any occasion and customize it with your own message and photos. Then choose “Premium” cardstock and checkout with FREECARDS.
Make sure to opt for in-store pickup so you don't pay a dime!