Is this the United States Post Office increasing sales by partnering with OEM greeting card makers, or Hallmark accessorizing base model cards with desirable add-ons? It is a near-perfect alliance no matter who crafted the treaty. Do see the joint logo sponsorship. This idea has been around for a while but I do not see it continuously at my favorite card stores. And when I do, usually the greeting category is limited and quite focused. I do carry many cards home by hand to my wife. But if they all had stamps, I would delight in easily mailing and surprising her all the more with postman hand delivery. Particularly if the postman cute and male to brighten her day further. If the concept catches on however, could we please have a outbound mailbox at the store exit. There are so few on street corners these days.

Compare directly to…
Cross Sell Postage Stamps at the Shelf Edge

For classy retail communication see…
Direct-Mail Direct from Store

For unusual strip merchandising in the card department…
Willowy Arched Strip Merchandiser Arm

For Postal and Office-service related posts see…
Paper Well-Presented
Clip-on Pegboard Straight Entry
Mailbox Point-of-Purchase Sign Promo
Miniature Wood Crate as Shipping POP
Office In-store Mailing Service Promo
Santa Mailbox In-Store
Santa Mailbox In-Store Redux via YouTube
Famous Fashions for Anglophiles
Cross Sell Postage Stamps at the Shelf Edge
Direct-Mail Direct from Store
Postage-Paid Greeting Cards

For a visual Pinterest Board summary see…
Office Services Retail Merchandising and Fixtures