Greeting cards allow humans to express a wide range of emotions, ranging from festive cheer to regret for having eaten a roommate's science project. Express yourself with today's Groupon: for $10, you get $20 worth of gifts, cards, and keepsakes at Hallmark, valid at 13 locations.

Since 1910, Hallmark has stocked its shelves with a wide variety of greeting cards, gifts, and thoughtful keepsakes. Patrons can write a formal request for better candy from neighbors with Halloween greeting cards ($0.99+ each) or record a personalized greeting card to document a baby's first words in English or made-up baby language. Keepsake ornaments ($9.95+) inspired by the memorable Peanuts comic strip feature Snoopy, Lucy, and Charlie Brown decked out in Halloween costumes, and a variety of scrapbook kits and photo albums help to preserve memories without having to pickle the brain. A large selection of wrapping paper, ribbons, and bags encloses gifts in layers of festivity.