Groupon offers the Built NY Alexander Girard Notebook Sling in January, La Fonda, or Retrospective for $19 plus $3 for shipping. That's a savings of $31 and the lowest total price we could find for this sling. This waterproof neoprene sleeve comes in sizes 12" to 13" or 14" to 15" and features an adjustable shoulder strap, attached Girard heart charm, and more. Deal ends May 17.